I Keep Getting Indigestion Nearly Every Day At The Moment,

I keep getting indigestion nearly every day at the moment, more so in the evenings after i eat. I feel like i am losing weight aswell. I have tried PPI's and they worked for the first 2 weeks or so but not anymore. I orginally went to my doctor awhile ago as I was constantly feeling lightheaded, and was getting heart palpitations. My blood pressure was low and i got bloods done ect. everything came back fine and i was told to try get more salt in my diet. Im still getting heart palpitations and indigestion. Im booked for an endoscopy end of the month. The only time I felt relief from these symptoms was when I was on holiday in spain. I felt soo much better, i dont know wether different climates have to do with it or lack of sunshine but since ive been back so are my symptoms :(