I used to have that problem alot more often than now.
At one point, I got up because I couldn't sleep for the pain I was in. Sat there at my computer for a while with tears streaming down my face thinking if I was going to hurt this bad I would just as soon die as to live this way.
After a while I decided to write it all down. Everything that hurt, so that when this passed I would remember it just to be able to tell the doctor about all of it.
In the beginning I didn't plan to write a poem, it just turned out that way.
I have it somewhere, will post it if I can find it. Another thing was that I way trying to turn something negative into something positive.