Sounds like you have allergies. Have you tried a good anahistamine? The one I like is a prescription called "Zyrtec". I also use liquid plain Robitusen cough syrup before bed (nothing to drink afterward) and it keeps mucous in the throat thinned over night and next morning I do have a voice, even if it might be a little raspy.

Seeing a doctor is a good idea, you will hopefully find out what the problem is and get proper treatment.