Collette, I am not a regular poster on here as I'm not the one with diabetes in our family - I'm here for my husband who's way of dealing with illness is to ignore it. I've had a lot of help from members and hints on cooking and diet which have been valuable, really valuable.
I've obviously missed your posts, but wonder if you have actually been diagnosed with bowel cancer because you seem to be having the same problems as I had, 15 years ago.
I suffered from very painful stomach cramps and (sorry) explosive diahorrea after nearly every meal or snack, and went through a huge battery of tests - some very embarassing and intrusive and uncomfortable (even painful). Eventually a biopsy proved I have coeliac disease and I was put on a strict No Gluten diet.
This means no pastry, bread, cakes or biscuits for EVER. It is actually basically LCHF although I can eat fruit and root vegs ad lib, aand its not as awful as it sounds. Substitute breads and cakes and pasta can be bought, for a price, but to my mind they're not tasty and personally I prefer to do without.
Have you been tested for Coeliac Disease?
If you have and its come back negative - why not try the diet (100% no gluten - read the labels) for a couple of weeks and see if it helps? You can stil be gluten sensitive with a negative diagnosis, Dr Google will help
One of my cousin's developed a lactose intolerance last year. I find the continued increase in people developing intolerances rather disturbing. The problem is that the figures are confused by people who decide avoiding certain elements in your diet is healthy.
I would advise caution with Dr Google. As I found out when I developed my heart problem there is a lot of out of date and mis- information out there!