Wet cough, stuffy nose for 2 months (thick green/white phlegm). don't smoke, no fever, no allergie, blood test ok, xray ok, no sinus inf.

See a doctor: It sounds like you have seen doctors. How you can be sure you do not have an allergy is beyond me. Suggest that you try nasal saline rinses twice a day with a neti-pot (see your pharmacist), and perhaps combine that with a nasal steroid spray. If you are a smoker or around second hand smoke, stop. The material you bring up needs to be examined, and you need a face to face with a caring doctor.