I Constantly Have Heartburn And Vomit At Least 4 Times

I constantly have heartburn and vomit at least 4 times a week esp if haven't been to toilet. I have had the vomiting problem a number of years and all the dr has come up with a few years ago after test was I have a loose valve at top of stomach. Despite vomiting and eating very little due to vomiting I am over weight. When I vomit I get pain in lower back or painful tingling across my shoulders. Does not matter what I eat or how little I still vomit