I have had implanon birth control since the end of May 2011. Prior to that, my immune system was great. Rarely got sick. Ever since June 2011 (so for 6 months) I have had 3 cases of strep throat, migraines, headaches, and many many sinus infections. I have not gone for more than two weeks without being some sort of sick.. sinus infections are more common for me, but I get migraines pretty often too. Do you think the birth control is weakening my immune system? Or is something else wrong.