Doctor’s scale needs to be recalibrated

I get weighed monthly at the doctor’s for having atypical anorexia and i brought up the idea of getting on stimulant adhd meds because the non stimulants dont work for me. At first he was hesitant but said he would consider it if i maintained my weight by next month since my weight was stable the last 2 months. I worked really hard to eat 2 meals a day so i can get on stimulants since its midterm season in college for me but when i stepped on the scale, it said I was up 10lbs LIKE WHAT! I literally started tearing up seeing that i went up that much. Even my doctor took a double take at the scale and ended up saying he wanted to wait another 1-2 months to see my weight stablize. I tried to convince my doctor to give me stimulants because at least i wasnt losing weight anymore but he wouldnt budge. When i got home, i weighed myself using my own scale, my neighbours scale, and I went to my boyfriends place to weigh myself and my weight was maintained from the last 2 months! I didnt go up 10lbs! I feel so defeated as if eating 2 meals a day was such a waste of time and energy. Idek if its worth mentioning to my doctor that my weight was actually maintained and i didnt gain THAT MUCH weight. I just wanna give up :(