Hi, as Brunneria says, I take both Metformin and Gliclazide. The info you have given us here is still incomplete for us to assist much. Do you have the ability to test your bgl levels? What dose of Glic are you taking and what timings for it?
Certainly Glic is quite powerful at reducing bgl, and can lead to hypo's. Are you low carbing? I find the hypo's for me are not too serious because I time my meds relative to my meals, and I know that the effects of a tablet recedes over about 4 hours, so lose their effect over that time. Thus if my 2 hr bgl test after eating is < 4 then I eat a small amount of carbs (digestive bic or two) but not sugar since that is too short a boost to really clobber a hypo - wholemeal toast would be better. Because Glic is not so aggressive as insulin, it is generally easier to deal with. But my opinion is based on taking only 1 tab for a meal, and it becomes more difficult to advise if you are taking more in one go, except if that is the case, then you could probably spread them out more over the day.
So I advise medium carbs instead of sugar. Chocolate contains fat which slows digestion, so is not a quick fix anyhow, You could consider a small increase of either fat or protein intake instead of carbs - it is slower to act but will not raise bgl too much. I found it very easy to overcompensate for low bgl readings so I then overshot and went too high
The Jelly Belly is most probably the Metformin, and there are many discussions in the Forum about this side effect of Met.