Hi everyone. Looking for some general advice here. 
I’m (F, 23) think I may have an anxiety/panic disorder, but I’m now 100% sure and would love some input, advice, opinions, or reassurance from anyone experiencing the same thing as me. 

Recently, I was at work (I work a very typical corporate desk job), took my lunch break and sat in my car, was snacking on some crackers when all of the sudden my body got really tingly, I got lightheaded, and my heard started racing. I was in a full panic. I felt like maybe I was having a heart attack or something because I was so caught of guard by it and so I called 911. Paramedics came to me right away, took my vitals (all normal), and then I spent about 7 hours in emergency having bloodwork, and EKG, and chest X-rays done; all were normal. I got fluids and was sent on my way. My doctor said maybe I needed to improve my diet and lifestyle, but I was really left without any answers as to what this episode was. This was on Saturday. 

I went home feeling genuinely concerned about my health and unsure what could have caused this, but I took the recommendations from the doctor and started incorporating more fruits, veggies, and water into my diet, and completely cut out any caffeine and processed food, which I really wasn’t having in excess to begin with. Sunday, Monday, and Tuesday, I felt okay. Didn’t have any major episodes or issues, but yesterday, it just went downhill. I was sitting at my desk working, it was a pretty busy afternoon, and all of the sudden I felt really weird. I felt weak, faint, dizzy, and my whole body just felt tight and almost like I was drifting away in a way. Like I didn’t have control over myself. I was shaking, and overall just panicked. I laid down, had a couple bites of my sandwich and some drinks of water, and nothing was helping. I felt like I was going to pass out or have a heart attack or that my body would just give up on me. In my head, I was telling myself to relax, deep breaths, you’ll be okay, but nothing was helping. I ended up going home early, and came home, took a warm bath and a nap and finally calmed down. 

Today, I felt like shit. I slept awful last night thinking about all of the possible things that could be wrong with me and thinking about, “what if I’m dying?”. Obviously, those thoughts didn’t help. Anyways, slept like shit, called off work today, had some lunch around noon and felt it again. It wasn’t as bad as before, but I felt it coming on, the feelings of fainted and panic, and I felt like I had better control of it but it was still incredibly uncomfortable. In total, this happened maybe 4-5 times today. Randomly.

I’m wondering if anyone can maybe offer me any possible insight to what I’m going through. Is it anxiety? Is it panic disorder? I never really struggled badly with anxiety in my life, and overall I’m a pretty happy person, I think. I have an appointment with my PCP on the 22nd (soonest I could get), but I am absolutely dreading work in the meantime. I’m scared of having an episode at work and making a fool of myself. I’m also ramming my head with intrusive thoughts of my impending death or heart attack, which I’m sure is overthinking, but I get so worried thinking about what this is. Any tips on how to handle this is appreciated as well. Thank you for taking the time to read this.