I'd give the rectal-route a shot sooner rather than later. The rectum always has our most severe inflammation, and can dictate: number of bms a day, urgency, etc. As it is the rectum that is the exit point, when it's unhappy and inflamed it will fit and give us no-end of troubles. Yes the rectum can bleed but it can have a lot of other symptoms. And being confused is quite normal with an UC, it is what it does to us (throws us random curve-balls, the unexpected, and baffles us just when we think we have it figured out). There's never easy A+B=C, more often than not a lot more difficult
The stomach pains, that's something else maybe: gerd, IBS, food-intolerance etc. Or I suppose the stomach pains could be trapped gas or stool, which can cause mild pains and aching.
Yeah not sure on the MTX, it might be doing nothing or it might be an assist. I'd just recommend throwing everything at the inflammation, get symptom-free and then whittle away what is truly necessary. I'd not kick any legs out from underneath the stool you're precariously balanced on until you know you're safely within a sustained remission.