a little bit on a sugar cube could release us from fibromyalgia pain for a short enjoyable time
Of course, the thing about LSD is that you never actually know what amount or strength you are getting. And, if you don't have previous experience with it you also don't know how your mind will react.
It is definitely not a guaranteed pain reliever.
It changes how a person perceives things, causes hallucinations, and can bring about very interesting experiences but it can also cause a person to think they are in a very bad situation: threatened when that is not the reality, or thinking they are on fire, or feeling extreme pain out of the blue.
A person should never take a hallucinogen without having a very safe and secure place to do it and an experienced person (meaning they have not only taken the drug themselves several times but also several times have been the guide for people who have taken it) as a guide and a safe person who will be with you for the duration and can talk you down or deal with any emergent circumstance.
It can be very cool or it can be the worst experience of a person's life. Some people have had negative feelings for years after taking it; others have had beautiful revelations that change their lives, others have felt paranoid for months afterwards or even longer, and some just have fun. And you don't know how it will be if you have not taken it before. You don't really know even if you are experienced with it, because this one time could be different.
Please don't assume that LSD or any other psychoactive drug is going to give you a relief from pain and an enjoyable time if you take it. Be aware that it can go in any direction.