Jerriann thanks a lot for your input. Its my pleasure to assist you but at the same time i am really sorry to hear about your illness. The first thing i would like to tell is this that you don't need to get stressed yourself about cancer because none of your symptoms are indicative of cancer. Here are the answers to your concerns separately.
Will the CT scan I had for urology assist in diagnosis?
Yes surely that will, all depends on the area which have scanned but usually it covers most of the abdomen and i will help in ruling out any growth etc in your intestines.
- What are possible causes for the acid and for the diaherra?
Its most likely that you have some lesion in your rectal area and that is causing that burning sensation, now that problem can be an anal fissure . The other cause can be due to the fact that this can be the first attack of something like inflammatory bowel disease but again its less likely due to the short history but possible.
- FYI my Dad died of stomach cancer (at 86)
Forget cancer, don't worry this is not what you have because this is not how cancer presents.
- What possible test am I looking at to know - I can't bear this any longer.
You should get the following at least; Stool R/E, Stool culture, Stool for ova, cyst and parasites, GI endoscopy. Rest of the investigations will be done as per suspicion.
Its best to see doctor at the earliest. Till you visit your doctor you should use yogurt as it will help you, take BRAT diet, it includes banana, rice, apple sauce and toast. You should drink Gatorade to avoid fluid and electrolyte imbalance.
I wish you good luck that you get well soon, please ask if you have any question because our discussion always remains open so you can always ask more and I will be glad to assist you. Your excellent feedback is requested and will be appreciated, regards.