Ugh, that's awful! Did they test you for CDIFF? My husband had similar symptoms and he wound up in the ER like you, but his CT scan showed some colitis and because he was a colon cancer patient they had him admitted. The hospital doctor then ordered a CDIFF test to be safe and it came back positive. It can cause a lot of gas, cramping, and horrible diarrhea. He also had nausea, sweating, and a fever though those symptoms can be attributed to many other conditions.
I hope you get some answers and start to feel better!
Caring for DH John, 41
DX: Colon Cancer, Sigmoid colon
Tumor type: Adenocarcinoma
Tumor grade: G2, Moderately differentiated w/invasion of visceral peritoneum
Positive lymph nodes: 6/22
Chemotherapy: FOLFOX (6)
12/17 ER and emergency surgery
02/18 Hospital w/ MSSA infected port, PICC line inserted, abdominal CT scan clear chest CT scan showed septic emboli & blood clots
03/18 Hospital w/ CDIFF
04/18 Chest CT scan clear
06/18 Colonoscopy Clear
08/18 CT Scan Clear, NEMD