I am sorry to hear about your problems
Given the fact that you have a steroid responsive rash and symptoms involving multiple systems I would be concerned abou the possibility of an inflammatory / immune related disorder like Lupus/ other collagen vascular diseases/ a vasculitis (blood vessel inflammation)
This would require a detailed evaluation by a specialist and possibly referral as indicated to a superspecialist if my hunch is correct,
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Regards
Dr. Gupta

