I just finished my 5th week of proton therapy for oral cancer. Skin is burnt like a bad sun burn. Mouth is sore for 4 to 5 hours after treatment. Get fatuiged easy. But I still can drive myself there, 35 miles each way. I can eat and drink ok, haven't lost any weight. Not to bad after 25 treatments 3 fields a treatment for mouth and lymp glands on left side.