Hi
@sarahpench, I am unsure of your age (and it is not polite to ask a lady)! Teenagers and ? early 20 year olds can experience growth spurts where growth hormones increase at times, causing increased insulin resistance. Certainly that happened to me, but the growth spurt was followed by a time of 'normality", hypos would occur and I had to quickly scale back the insulin doses.
Alternatively, maybe there is another explanation or two for your increased insulin resistance.
Some people have commented that Metformin taken with a meal tends to cause less tummy upset. Others have been prescribed a long-acting version of Metformin and find this causes less tummy upset.
I hope things settle down for you soon. Best Wishes.