I used to get that and found out I have gerds after giving birth to my son, gerd is short for gastroesophageal reflux dieseas I was on losec for 3 months and with diet/exercise I have been able to control it..

It was disgusting my stomach always hurt, I kept feeling like I had acid in my mouth and I just felt miserable from lack of sleep.

Honestly I would see a dr, stress made it worse now I have been able to balance out everything/keep it under control but once in a blue I get heartburn (a symptom of gerds as well)

see a dr, the meds they gave me really worked.... But the best thing I ever did for myself was o rid my diet of caffeine and fried food..