I posted this on r/mentalhealth and didnt get much response, so I'm hoping to maybe get a little more help.

This is going to be a long one so. TLDR: round 2 of the worst anxiety and depression I've ever felt is back and I don't understand why.

Back in June I went through somewhat of a big life change. I moved in with my sister and her husband about 20 minutes out of the nearest city. At that point I had about a year of not working and being home way too much. So at the time of the move I was feeling fine, I actually still think it's a good decision my boyfriend and I made. As soon as we moved in I was bombarded with what I'd consider level 100 anxiety.
I couldn't eat, I couldn't sleep, I couldnt work, constant panic attacks, diarrhea, and 24/7 anxiety. I immediately had to stop working and I reached out for help. I started therapy, I started trying to change my way of thinking, I started meditation, and it feels like it's all been in vain. That first period of major mental disarray lasted about 2 months. I ended up in the hospital at one point due to dehydration. After those 2 months I started to continue living my life. I reached out to old friends and ended returning to an old job and everything was finally feeling normal again, until last Wednesday. 
Now my boyfriend and I had planned on rescuing a puppy and we did. Now the pickup date was scheduled for the 15th of September, but they called on the 1st to say she was going into her spay surgery and would be ready for pickup that day. We weren't ready. My boyfriend was working and so was my sister and her husband. I was at home caring for the dogs while we ended up finding a stray and holding on to her while we waited to see if anyone would look for her, but no one did. I have to drive to the next county over to drop her off at the shelter and only had a bit of time before having to pickup the puppy. After picking up the new puppy I drove home and on the way was stopped for speeding. I was just really distracted by the puppy roaming around in my car. Once I got home I had to take her straight to our room and let her sleep off the drugs. At this point I was stressed out of my mind and hadn't gotten very good sleep at all, then that first night the puppy kept waking up every hour to cry in her crate and it woke me up every time. I think it was around this point my mental stated broke down for the second time and I am again going through level 100 anxiety. 
All the symptoms returned full force and I'm really scared this is going to happen every time I go through some sort of life change. All I do now is cry and panic. I called off work to watch over the puppy for the first weekend, but it's very overwhelming having to care for her while no one else is home and I'm just feeling anxiety.
I don't want to return the puppy, I dont think that would help. I'm mostly upset about having to go through this again.
I have called into the clinic and spoken with people to try to calm my panic attacks, but it isn't really woking. I don't know what to do anymore, I hate feeling this way. I feel like the worst kind of burden on my family and I start feeling like I should just disappear. I don't have plans to hurt or kill myself, but this just sucks so bad.
If anyone out there reads this, thank you. It's probably all a jumbled mess of words, but I'd appreciate any thoughts or stories from others out there maybe going through something similar