I’ve got a pain in my left side since October 2018 and sickness taste after eating

ive been struggling since October last year with a pain in my left side under ribcage with a sickness taste in my mouth after eating. I am 53 years of age woman normally fit and well. i have lost 2.5 stone since this started taking me to 9.5 stone and i am 5 ft 7 inches tall.

ive had a scan and they only found a small kidney stone and the kidney specialist say it wont be the stone causing the problem.

Can anyone help? Or offer advice.

Have you had an endoscopy to look for gastritis/h pylori?