Hi
@Paschal, I am also Type 2, but slim, and have never been considered overweight. As others have observed, I'm disappointed you weren't given the opportunity to change your diet and exercise regime before being put on Metformin. I was given that opportunity, and for several years was not on medication. As my condition progressed, I was put on Metformin, but it didn't agree with me, although I did then lose weight. I came off Metformin, my numbers having improved, and gradually returned to my original weight, by eating a high protein, high fat but lower carbohydrate (and no sugar) diet. The trick is, to ensure your calorie intake remains at the level you need, but do this by eating more proteins and fats. Fortunately, my cholesterol is low, so I can get away with animal fats - you may not be so lucky. The NHS website has info on the required daily calorie intake for different genders/ages, and advice regarding putting on weight / maintaining weight.
I am now on a different medication - Sitagliptin - which is helpful in bringing down the background level of blood sugar in my system, which is too high without it. Then my diet and exercise routine does the rest - preventing me from "spikes" of excessive blood sugar. Seems to be working for now! And no side effects.
Regarding Type 1, because I was slim, I was tested for this right at the start of my journey 14 years ago - so I would have thought you should have been, so I think you should check this with your GP.
Good luck - and fire back any questions if you have them.
Nick