I did some research based on my own case re the above subject. My platelet dropped significantly two years ago and stayed in hospital for one week undergoing some IVIG and steroid treatment. Prior to ITP symptom, I had hypothyorid and was taking bee propolis as generic nutrition. After discharge from hospital, I spent some time googling information on ITP and what I found is that ITP might have something to do with thyroid function and bee products. My hypothyroid was mild and I didn't take any synthroid. What I did after discharge from hospital is 1) taking synthroid everyday. 2) stop eating any bee products which inhibit the production of platelet. My platelet has ever since been showing a a stable 100 level, still lower than normal but nothing serious happened ever since.
So in this thread I just want to share my experience in case someone have similar symptom.