I've been on Sertraline for 7 years now, at 100mg. The first 10 days were horrible, as is the first few days now if for whatever reason I don't take them for more than a couple of days (not on purpose, either ill, didn't realise I was at the end of a pack, left them at home by accident when going away etc. Life happens.) Heart racing and really loud and near the surface, absolute non-stop brain talk, twitchy, panicky. Seriously wanted to come off them, was frightened they were actually causing damage. But I'm so glad I stayed on them, after trying so many finding one that actually works well for me is amazing. Well worth sticking out the opening side effects, if you're struggling. Best wishes!
FWIW, tried citalopram (no side effects, but didn't help symptoms either) mirtazapine (was pretty good at regulating symptoms, but made me sleep 10 hours+ a day, no use in my job), fluvoxamine (absolute nightmare, rapid weight gain, constant nausea, constipation like I've never had before or since.)