LSD is one of the safest substances to use if we think physical issues. On the other hand, mentally it could cause problems but your brain seems to be working fine as far as one can tell from this thread. I would be more concerned about cannabis use (if you smoke it) then LSD. Also, I have seen many friends have mental issues because of heavy, long term cannabis use.
I probably had around a few hundred doses myself and I don't think that it caused me any problems. The only times I had bad experiences were usually because of shitty, lame company who caused lots of frustration. I had a couple bad trips on irresponsible high dose combinations with multiple other substances like MDA, MDMA and weed. They were quite scary and long but I wouldn't change a thing; I got a much needed new perspective on everything with LSD.
@t_wrex, Bedrock Records rockS especially Nick Warren on LSD. I hope that you are ok after 8 years of LSD use.