FWIW..I am a retired GP..recently separated from my wife now living with my parents in Congleton..the stress of the situation made me lose quite some weight..I started to get abdominal pain and noticed a mass in my abdomen..I have a nephew who is a surgeon at Whiston Hospital who got me looked at rapidly by a colleague of his.Their care was immense.
So had an urgent CT scan..showed much the same as yours..thickened bowel, increased vascularity, swollen lymph nodes.Unfortunately the CT showed other stuff but another story.. So urgent colonoscopy. Anyway the procedure was painless and yes they told me their findings immediately..it was diverticulitis and not cancer. They did take biopsies but all fine. If you have colitis, readily treatable.
If you wish to PM please do so if it helps. Am at a funeral today so may not respond until tomorrow. I am sure you will be fine.