Sorry to hear about your relapse. I first got ITP age 15 and thought I would never get it again, but 5 years later I relapsed, then a year and a half after that. Each of those three times my counts went to 1 or 0 (uk money) but responded to Prednisone or IVIG.
When I had it a third time I asked my consultant if he had had a patient that had had it three times and no more....he said he had a male patient, I walked out vowing to be his first female patient that never had it more than three times. Touch wood, it's now been 23 and half years. So long remissions are very possible and that is what I wish and hope for you.
Also I think the times I had ITP, were often times of stress through multiple sources (long distance running, which is a good stress, but nevertheless a stress to the body, intense academic study, emotional stress - bereavement etc). I did a York food intolerance test and reduce my consumption of yeast and dairy, which has massively improved asthma and skin outbreaks.
I hear you about hating prednisone, I think I would refuse that if I ever get it again, it's so horrible. I would offer to pay for IVIG I think.
Good luck with it all