I keep getting stomach pain after lifting things that are relatively heavy. Like at work, lifting 5 gallon paint pails. Or at home if I lift plant pots. It usually lasts a couple days, then it's fine until I lift something again. Feels like an ache, stomach cramp. In the beginning I would take antacids thinking it was something I ate with no success. This has been going on for quiet some time and I'm just pinpointing it to when I lift.