The way my original doctor explained it to me is that sulphonylureas trick your pancreas into producing more insulin, which only hastens the day when the poor thing packs up from exhaustion and we need insulin injections to replace the function it no longer performs. They can cause hypos and are self-defeating in the long run. It would be so good if there was a way to bring our blood sugar down quickly without the long term nasty side effects. Something we could take only when we're high.
What medication are you on ? You could keep your diet roughly the same and walk up through the quantity and quality of meds until you have control.
You could change your diet - halve the portion of carbs you had in a meal that sent you high the next time you have it. And try again. Your meter will dictate portion sizes of carbs.
Go out for a two mile walk if you are in the teens bgs. Bernstein suggests a two mile walk a day ( or equivalent) plus dumbells on alternate days is the minimum sort of exercise regime for a T2. He has little old lady patients in their seventies pumping dumbells.
You could also test for your peak/spike. After a good pre-meal number, have a sandwich with two slices of bread and test your bgs every 15 mins up to 2 hours ( first one 15 mins after starting eating). This Should tell you when you peak. ( Most T2s peak between 45 and 75 mins after eating. Once you know when your peak is, do your exercise at that point to blunt it.
The usual treatment algorhythm for T2 diabetes is ...
...D&E ( very few T2s can sucessfully control it with just this)
...D&E plus metformin
...D&e plus metformin plus a sulf e.g Gliclazide ( and don't listen to urban myths about them wearing out your pancreas)
...D&E plus metformin plus a sulf plus a TZD ( the sulf might be dropped)
...D&E plus metformin plus byetta
...D&E plus metformin plus an introductory insulin regime ( e.g. single dose of lantus at bedtime or a mix twice a day ( e.g Humalog Mix 25)
...D&E plus metformin plus a true physiological insulin regime ( basal/bolus)
Note metformin is a "wonder drug" that has great heart protection properties as well as helping with bgs.
In my view, having been at it for 17 years, most T2s in this country are several steps behind where they should be on that algorhythm. Many t2s are struggling not to go on insulin - which is a totally wrong-headed view, insulin ( when they are finally allowed to go on it ) makes T2 control straightforward.
But if you are hyper a lot of the time use your meter to regulate your carb portions, get a suitable exercise programme and get the medication regime working effectively for you.