I went cold turkey off of citalopram when I was a teenager and it was a pretty unpleasant two weeks of heart palpitations, but the immediate benefit of no longer experiencing emotional blunting made me avoid taking any more antidepressants for 10 years. I was prescribed it by a GP and never given any real support in my mental health or in coming off of it. It was a real black pill for me on the UK's treatment of mental health issues.
Last year I started taking buproprion (Wellbutrin) after seeing a private psychiatrist in Romania, and I found it beneficial, but ended up losing more than 10kg, and becoming malnourished to the point of my hair falling out. Again I stopped of my own accord, and buproprion has basically no cessation symptoms.
This spring I saw a psychiatrist through Romania's public health service who prescribed me vortioxetine (Brintellix/Trintellix) after I shared my history and it's been a game changer. I experience basically no side effects besides a slight reduction in libido, with no other effects on sexual function. It's really helped me to find my balance again. And I see a psychiatrist once a month paid for by my public health insurance with the medication fully comped. Vortioxetine has a half-life of 66 hours so the one time I did have to skip a day and a half, the withdrawal was not noticeable.
Just sharing this to say that there are good doctors and good meds out there, and that having low tolerance for one medication doesn't mean that you shouldn't talk to a doctor about it and try others.
FWIW quitting any SSRI cold turkey is highly disrecommended vs gradual tapering over ~2–6 weeks but even that current guidance is probably too aggressive.
Something like one step down every 2–4 weeks or ideally hyperbolic tapering is better for neurobiology but that's also a PITA.
https://www.outro.com/blog/stopping-antidepressants-what-is-...
I've heard similar stories. Different people react to the same med differently
It can't be emphasized enough for me just how unpleasant side effects like heart palpitations, tachycardia and related conditions really are. For me at least, those kinds of conditions trigger something close to a panic attack which feels like a very deep seat primitive protective measure in our brains.
Laying in your bed trying to be restful and feeling your heart slamming away at 140 beats per minute with little you can do about it goes behind miserable into outright alarming, even if you are "used" to it.