Keep spilling ketones and loosing weight but I’m not T1...?

Diagnosed at 17, was 225lbs and suddenly dropped to 180lbs. A1C of 12. I was put on metformin 500mg 2x a day and BG didn’t usually go over 180-200 when eating with carbs (not many <60) and would wake up in the morning <150. No matter how much I eat I keep loosing weight, my BG is controlled but I don’t stop getting both thinner and lighter. I’ve also noticed I keep spilling ketones, saw a moderate level and drank so much water I nearly puked and it eventually made the ketones wear off. I’m now 18, using insulin, I was gaining weight again at the beginning but I’m loosing again. My C-Peptide is 2.2 so my doctor says it’s not T1 since it’s been 2 years now. I did test positive for GAD65 at 197 IU/mL but doc says C-Peptide isn’t low enough to be T1. I’m scared because not only am I loosing fat but my muscle is nearly gone, my stomach caves in and my rib cage pokes way to far out. Doctor keeps telling me I’m fine but I know something is wrong, my mental clarity is so bad, my memory is horrific. My toes are numb, sex doesn’t feel good, I barley even feel my orgasms anymore. I’m always tired. Anything similar happen with you guys? I’m just at a loss for answers...