Problems after my tonsillectomy?

It has been over 3 months since I had my tonsils removed. There is no pain or bleeding but my throat always feels extremely congested. It's been like this for 3 months now and I haven't had a cold in a long time. I'm experiencing trouble speaking as well as breathing. It's gotten to the point where I've had to change my sleeping habits because I can't properly breathe as I sleep. Does anyone know if this is normal? My throat looks perfectly healed. Any advice would be appreciated.