While I am not on Ty at the moment, I know exactly what u are talking about. Ty weakens your immune system as do all other approved MS meds. I can't say if u had a reaction to TY or if it weaken you (as in my case). I did not have many headaches, but was ill 80 to 90% of the time I was on Ty. About 1-2 visits a mo to the GP for drugs. For me it was worth it. Quality of life was low, but my MS become stable. The illness was kind of like a 2yr old who caught everything. I'm sever MS so I continued the med. I understand your decision to leave and wish you well. Just wanted u to know there are others out there somewhat like you.XOXO