Unfortunately a lot happened pre vaccine too. I was one of them. 4 years on I am 95% recovered but it took over 3 years. I know many others in the same position as me. Thankfully a lot are recovered or recovering but there are a proportion who haven't. There are also children in this category too who have now missed 4 years of their life.
I had 2 vaccines and they made me worse so I fully believe LC can also be caused by the Vaccine too. I think it can be virus or vaccine caused and many medics now support this view. Personally I had heart issues as a result of Covid (myocarditis) and long covid symptoms from the virus itself, I got myself to about 50% recovered (after 1 year) and then had 2 vaccines and went back to more like 30% recovered. Thankfully I didn't have any more vaccines and made it back to 95% but many people aren't as lucky. Many people are still getting LC, vaccinated or not.
Although I have used a lot of tools to support the psychological aspects of LC (I am a therapist) no amount of those could heal my myocarditis or what I have been left with (partial branch block / arrhythmia). Sadly not much I can do about those things! Thankfully time has helped. LC is extremely complex, there's no one cure or answer to help anyone but there are things out there that do help.
I am sorry for your vaccine injury @Useruser1