I was doing naposims at 60mg a day,no upset stomach but KILLER back pain.
If you have indigestion or heartburn try zantac 75,works the best.
I never had any problems with stomach pain from d-bol but I regularly get heartburn every day,24-7.
The only thing that works for me is zantac75,if it is killing you and you can't wait for the zantac to kick in,take a couple rolaids with the zantac.Try some pepto bismol too,good luck.