Distended stomach with excessive belching & farting

EDIT: I think they found the culprit. It's the side effects of the new chemo drug Capecitabine. Although the special pharmacy checked for interactions they didn't really go into side effects or that the drug can cause serious stomach and intestinal issues. She's been in the hospital since January 4th.

My wife has been in chemo of one form or another since 2023 (the most current is Gemcitabine and Capecitabine). She's been in and out of the ER and hospital numerous times for excessive pain, then diabetes, and lastly colitis. Over the past month or so she has been in pain with a distended stomach which the hospital, after a CT scan, said was air trapped in her stomach and they discharged her. She's been taking prescription-strength Pepcid and anti-gas but still belches and farts without any apparent change in her stomach (she appears to be about 4 months pregnant and it's as hard as a rock). No matter how much she belches or farts the pain and distended stomach remain.

Has anyone else suffered from this? Does anyone know of anything that would help, either a prescription or a home remedy? Thanx in advance!

EDIT: She had a bad night and I had to call the paramedics to get her to the ER. She just came back from getting another CT scan and we're waiting on the results now. Massive pain and she couldn't even talk coherently. She's on IV infusion and they gave her Dilaudid for the pain. Now we wait.