I do a fair amount of cooking. After about 2 or 3 hours of a standing at the kitchen counter and sink doing prep I begin to get pain behind my rib cage, it then travels down towards the hip bone. Sometime there is a pronounced pain on my upper right back just near the waist. I take a break for a half hour or so, get back to cooking and after a half hour or so the pain begins again. I have tried removing shoes and standing in stock ing. feet - doesn’t seem to help much. I am 82, weight about 115 pounds and walk 3 to 5 miles a day about 5 days a week. Fitbit keeps me motivated. I live in Denver, CO. and the trail I walk is hilly and probably 400 foot climb to the end of the trail. Is my problem part of aging or should I visit a primary care doctor for this. It seems to be getting worse over the last month.