Op, I get where you are coming from as I've had horrendous health anxiety since my dd1 was born in 2019. It started when I felt a raised lymph node (that had been there years but I cooked it up to be lymphoma, carried on through to finding a breast lump that I panicked was cancer and turned out to be a fatty lump, to my new one of heart problems,
I was prescribed 50mg sertraline which was amazing and I came off in July as I felt that I didn't need it anymore. Then around the beginning of November dh and I were in bed watching tv and out of nowhere my heart started thumping in my chest for about 4 seconds, never felt it before and it scared the life out of me. I started worrying about my heart and went back to my GP and explained what had happened and he said palpitations are very common and can happen for no reason whatsoever, and put me back on Sertraline.
A few weeks ago I shared a few bottles of wine with a friend (keep in mind I rarely drink now) and woke up the next day hangover free but my heart was racing, then I realised I'd been drinking on Sertraline, googled, and then worried about a serotonin overdose. Rang 111 who, like others have said here, sent me to urgent care because I was specifying heart problems. We sat and waited for about three hours - ECG and blood pressure later and o was fine, and the doctor told me alcohol blocks sertraline from working, so what I was feeling was anxiety.
I am now trying to move past worrying about my heart - I'm using a lavender sleep spray at bedtime and trying to focus my mind on other things such as what I'm doing the next day, holidays, anything. I've also downloaded a word search game on my phone so when I'm highly anxious, I try and distract myself with that during the night.
Like others have said, please take your medication - give it a go and don't worry about the side effects. You've been prescribed them for a reason.
The best advice I got from my GP was this:-
'If I told you that you had heart problems or blood pressure problems and needed tablets for the rest of your life, you would just take them. Taking medication for anxiety is exactly the same - it is a condition that is stopping you from being the best you that you can be, and medication can help with that's