Hi, I am an American Board Certified Neurologist with vast experience in diagnosing & treating all types of neurological & other medical/gastrointestinal conditions including the concerns of “Possible bowel disorder” you have mentioned here and I am very glad to help you with your health concerns.
If you meant a gastro-oncologist (an oncologist with expertise in diagnosing gastrointestinal tumors) to explore the possibilities of a gastrointestinal tumor or cancer in your case – I do not think tumor or cancer is the first thing we should be suspecting in you to explain your symptoms, so seeing a tumor specialist is not immediately needed, rather you may try to follow up with your regular Gastroenterologist, or if you have not already seen a gastroenterologist so far then it is better to see one now
You do have symptoms that appear to be originating from the GI Tract (Gastrointestinal tract)
You have also wondered whether the diverticulosis is causing these new symptoms, the diverticulosis itself is not expected to cause symptoms but when it gets infected or inflamed it is called as Diverticulitis and this can cause the type of symptoms you are having
There could be some other gastrointestinal problems too that cause similar symptoms
One or otherway it appears you may be suffering from some kind of gastrointestinal disease which seems to be causing your symptoms
Since you recently had a colonoscopy this is unlikely due to a tumor or cancer etc but there are other possibilities like diverticulitis or other conditions that can be causing your gastrointestinal symptoms and you may please try to see a gastroenterologist so that you can receive a thorough investigations to find out the precise cause for your symptoms and then treated appropriately.
Once again I reassure you tumor or cancers of the gastrointestinal tract is very less likely the cause for your new symptoms, rather we need to explore other possibilities including Diverticulitis, Colitis, and other GI causes and you may try to see a regular gastrointestinal dr to get this further evaluated & investigated and then treated appropriately depending upon the test results.
Please let me know if you have any further questions, and please click a positive rating (preferably 5 Star/Excellent) to credit for the time & effort put by me in answering your health question, and this is the only way I will be credited for my service to you. If you have follow-up or additional questions you can ask them after the rating too.