What Causes Severe Discomfort And Pain In Upper Abdomen?

Hi-- For the last month I have had a constant feeling of indigestion in the upper part of my stomach and it did seem to get worse at night but now seems to come and go all day. I had an ultrasound a few days ago on my kidneys, liver, and liver that came back normal. Today I felt pain right below my ribcage on the left side and pushed where the pain was and the pain was much worse. Whatever I was pushing on below my ribcage was definitely sore. It doesn t seem to matter what I eat or when that causes my pain to return. I have not run any fever and my blood pressure was 128/78 three days ago. I am 67 and I have been in excellent health most of my life. I still have my appendix and have had no surgeries on my stomach other than a tubal some 40 years ago.