I decided to be vaccined with Biontech/Pfizer. I wasn't sure if it was a good decision. I have several issues, and I feared a worsening (which is what I fear most). 10min after the jab my arm got sore. I got a light periodic paralysis attack, most probably from all the excitement (epinephrine is a trigger), which resolved fast with potassium. I felt worse for one day (mostly exhaustion and headaches), I had a painful arm for 3 days, and my muscles were/are worse (weaker, burn faster as usual). A bit like I've overdone it. On day two, for ca. 2 days, I felt an overall improvement of exhaustion, energy, and headaches. I felt "turned up". I never thought to fall into the "improvement camp", and I'm very relieved. Since side effects are milder after the first Biontech dose and worse after the second, I'm quite curious about what will happen after the second dose.
I am not vaccinated out of conviction, to be honest. I still think the evidence base is not that good (although it is much better now, since millions of people have been vaccinated) in regard to side effects, including longterm effects. My impression is that, mostly, people with more severe side effects are left alone. There is far too much hype and propaganda vs. science. In case of mRNA vaccines, though, it is that mRNA is destroyed pretty fast in the body, if I'm informed correctly. So I wouldn't expect any longer effects in that regard.