Hello redditors, 17 year old male here. I am here to talk to you about how my anxiety and hypocondria got my brain.

It all started in June 2021, school had just finished. I and my dad went to a car meeting in a race track, with a pretty old car, (so no air conditioning at all). We went there in the early morning and went back home in the afternoon. It was a very fun and enjoyable day.
The meet took place at a race track at open sky, the day was extremely hot, at just 9 AM I believe it was already 24 degrees Celsius hot, so you can imagine how the rest of the day was. 
Anyway, as soon as I got to my grandparents' home, I got at my laptop to entertain myself before going to sleep. At around 9:30 PM I felt the urge to go to sleep which was very weird, usually, I can stay up to 1 AM pretty easily. 
As soon as I lifted from the chair I felt kinda weak and sick. I went to tell my mom and after that I went to the bathroom because I had nausea and vomit. After around 30 minutes I feel better and that's it, probably an insolation from the very hot day. Wasn't such a big deal. 

However, in July, all at a sudden, during one evening I start to feel sick again, just like that day and I wasn't exposed to sun that much in the past few days. 
I went to tell my mom and threw up, this time tho, it was more painful, the nausea and stomachache was a lot more annoying than the last time. 
I was like that for around 1 hour, after throwing up a few times I start to feel better and go to sleep. 
The next day, it happened again at around the same time in the evening. This time it would be a nightmare. It was around 8 PM, I was at my laptop and start to feel just like the past day. This time the nausea and stomachache would last for more than 3 hours before we finally decided to go to the hospital. 
I was crying out in pain. 
At the hospital they suggested to wait until the pain goes away, usually it just goes, you wait for a while and it goes away. But sadly that was not my case this time.
They suggest me to get a shot for the pain but I refuse (yes, I was a dumbass not to get it, I also fear needles a lot lol). 

(It was around 11:15 PM, I was in my ex-small town)
As soon as I exit the hospital with my mom, we went to the local pharmacy to get some tablets to handle the pain and nausea. Since it was night the pharmacy was closed so we had to call the pharmacist to come and sell us the tablets. It took her 20 minutes to arrive and meanwhile I was constantly throwing up at the side of the road while people were partying in a disco at the end of the road, the abdominal pain from the nausea was terrible and couldn't handle it at all, I was crying out in pain and my mom was trying to hold her tears too, seeing her cry would be a lot more worse for me psychologically, I then highly regretted refusing to get the shot. 
After buying the tablets and getting one, around 15 minutes later I start feeling better and went to sleep. 

The day after I started feeling very scared and anxious to get sick again, but knowing we had bought the tablets it kind of calmed me down. 
It was the day Italy won against England in the euros of 2020 (which took place in July 2021 due to COVID-19 for those who don't know). 

As soon as the evening begins I start to feel weak but not very sick. My anxiety was right, I had some kind of stomachache and a little nausea, but it wasn't as bad as the past day. I started freaking out and crying believing I would be sick like the past days. 

I eventually would feel weak, a little sick and anxious for the next days' late evenings/nights for around 2 weeks. 
During these days, I was scared for the night to arrive. 

Obviously some days later I went to the doctor's office and got checked up for well, I was told to do some blood work to understand what I had exactly. 

The first blood work exams were messed up by the lab so I had to get another one done. 
It came out I was going through mononucleosis, "the kiss disease", you get infected by saliva or body fluids I believe. I don't know how I got it, I don't even have a girlfriend and my family members didn't have symptoms of it, whatever. 

All of these events mentally damaged me and I am still suffering its effects. 
Whenever I have some common symptoms just like a normal headache or a little stomachache, I begin to get anxious and worry too much about it. 
If it's something else, I would look on the internet for my symptoms and search what causes them. Internet says a lot of things which can be true or false, if internet was a doctor, everyone would be diagnosed with cancer or some terminal diseases, lol. 

The events of July 2021 happened in my ex-house, in fact, every time we go there to stay for a while, anxiety kills me every time. 

Sometimes in the late evening/night, maybe after a long and extensive day, after getting back home and just being tired gets me somewhat anxious as it reminds me of when I lifted from the chair and started feeling weak before beginning to throw up. 

I don't know what to do really this is stopping me from what I want to do in the night, what should I do? 

Thanks for reading my story.