Hi..welcome to the forum.
Regarding not necessary to increase meds....what exactly were the meds that the doctor would have increased?
You should be on at least the retention enemas...they will get up to and into (maybe even a touch past) the sigmoid. It would be good to keep all clear above where your UC is at this time. It can be a great deterrant for it to spread.....which it's definitely possible.
Where exactly did your doc determine your uc...as in how many cms or inches?
Are you still taking the suppositories? Did you stop them before Christmas.
If your doctor doesn't want you to use higher dosage meds...at least get him to give you the 1000mg suppositories.
If you're having some symptoms...you're not on enough meds..and the fact that your stools are looser could be a symptom that your UC is higher than the lower rectum. Sporatic bleeding means the mucosal layer is very fragile...trying to heal, but not quite.
The symptoms during the day could be flare, could be certain foods or can be IBS/stress...or all 3. Throw in nearing a period (if you're female)...that's 4.
When did you see your doc last? When was your last c-scope.
I very much second the suggestion of probiotcs.
I've the feeling you're not in N.America..