Had An Ear Problem (swimmers Type Feeling Like Water In

had an ear problem (swimmers type feeling like water in it all the time) for about the last 3 months! Went to dr last monday and they put me on cephalexin 500 mg cap lup 4 pills/day. by thursday a.m had sever BPV (ended up in the emergency room). They sent me to a PT and he did the Epley treatment on me. Feeling better but still taking the cephalexin and have a headache. Should I continue to take it and will it help cure the inner ear infection and sinus infection?