Does anyone know anything about post op acid reflux?

I had a hysterectomy last Wednesday, (one week ago) and immediately, I had a problem swallowing, and experienced a sore throat when swallowing. I was told this was normal due to the breathing tube used during surgery. My sore throat and ability to swallow has improved, but every night since the surgery, I have woken up at 3:30 with horrendous heartburn, worse than I have ever had before. The acid is so strong, it I can taste it in my mouth. I haven't taken any medicine, remembering back when I was pregnant, tums, and antacids, made me nauseous. Now I drink a big gl of milk, but end up vomiting that an hour later. The milk does temporarily sooth the heartburn however. Does anyone know if this is normal? Is it related to my pain pills? (Lortab, and hydrocodone) Thanks in advance.