Hba1c value 6. 5. It's controllable?

I do blood work every year for diabetes and my values were always within normal. Always it will be Below 5.6 only which is normal. I did a blood work last August and it was 6.5. Dr put me on metformin 500mg once a day. I also gained lots of weight in the last 2 years because of my medicines for other chronic pain. So I gained weight around 30 kgs. I am 105kgs now. I was taking metformin once a day and repeated the blood work in November. It was 6.5 again and Dr put me on 1000mg metformin twice a day..so 2000mg a day. I am taking it since November and have to repeat the blood lab next month. I feel so nauseated since I started this metformin. I used to eat lots of rice and carb items. I am reducing it now and focused on my diet. Irrespective of this, my weight didn't reduce it at all and it remains the same. Whether 6.5 value is higher and whether it's controllable? Also, I have high inflammation in blood since 2021. My CRP is always high. Repeated CRP blood and it's high.