Odd, you have ITP? I had TTP, a little more serious, but at least curable. Had my creatnine go up to 9.6 when I had it. Man, what a trip! They were worried that I would go into a coma, so no pain medications. I was awake and alert, with nothing but a shot of lidacain, and they put a central line in my neck. OUCH! A couple days later, they did a bone marrow draw---no pain meds and no anesthesa. OUCH again. I will never, ever, ever forget that. I'm glad things were a bit foggy with my kidneys that bad, cause I still remember how painful all that was.
My uncle has ITP as well, but things are well managed for him. I hope they are ok for you as well.