I'm going to be honest here. The body tries to get rid of too high blood glucose by producing extra urine to get rid of it so we wee it out to get rid of it, so the extra urine is actually helpful since too high blood glucose is literally a killer. The drugs you are taking encourages the body to do that very thing, that's why the very best thing anyone with too high blood glucose can drink (sounds OTT at first) is good old plain water to produce even more wee, but the glucose in it, will be more diluted. If it isn't diluted enough that causes even more discomfort because the glucose soaked wee encourages bladder infections like thrush to thrive leading to something us females at least call "the Great Itch" because that's what thrush does to us down below, if you think having to pass water so often is bad, being in any polite company, when those parts clearly need fresh air at the very least can be awful. If you do try and get relief by surreptitiously scratching (rubbing through clothes cos we all know not to actually scratch there) it makes it far worse instead of the opposite. Hell.
Sorry to be so graphic. But when gentler things like metformin (and yeah I do honestly know about the gastric side effects that it often has) aren't enough the heavier duty brigade is needed so that's what you have right now. The better you can stick to lower carb eating and drinking and incorporating that exercise, the sooner you'll get some relief. Honest !