These are great questions, and ones I'm sorry you have to ask. I think it's great you're keeping a list of your symptoms and noting exactly when they happen. I saw a GI doctor familiar with endo about similar cyclical issues, and they were more helpful than any of my other doctors with these symptoms. My excision specialist also knew about these symptoms, but he didn't find endo on my bowels. Though, he said to be certain he'd have to take my intestines out and search inch by inch, which he wasn't qualified to do.
I was told my issues might be related to several things outside of endo on the bowels, including general body-wide endo-related inflammation in my blood — any kind of inflammation in the GI tract can cause diarrhea, vomiting, etc. — hormonal changes with my cycle, and/or an overactive sympathetic nervous system. But bowel issues can be so complicated, and I think it's definitely a good idea to see a GI doc. They can rule out any infections or other bowel disorders. A friend of mine with ulcerative colitis has similar symptoms but no endo. A doc or dietitian may also be able to help pinpoint any triggers that may not be obvious.
Always feel free to get a second opinion if this doc doesn't answer your questions. In my experience, many doctors aren't experienced in bowel endo -- even excision specialists -- and most don't really know how to check for it. A good place to search for an endo bowel specialist is at iCareBetter.com or through Nancy's Nook on Facebook. Keep us updated! - Keri (team member)