Hi, I have had a problem of acidity since childhood wherein whenever I have some oily food, tea etc. There's a very painful burning sensation in my stomach which goes all the way up my food pipe and it feels like the acid is going back up the food pipe. I also get a lot of saliva in my mouth due to this. Related to this is my diet is complete with protein, carbs but still I am very slimmed down. It feels like whatever I am having is simply not building my body. Are both the issues related and how do I fix it??