I imagine it’s due to your posture changing somehow and you standing up straighter? Not sure how old you are, but past a certain age it’s extremely unlikely that you’d be growing taller, especially at that rate. If you genuinely feel like you’re growing then it might be worth seeing a doctor
From fasting? I don’t know. But I do know that if your body feels/is stronger, it can hold you higher. There is a genetic max but if you say work out regularly and strengthen your body, it’s not unusual for people to add a couple inches. Especially if they were relatively weak before and had bad posture/weak core muscles
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Personally I might ask your doctor about your meds and ADHD in general and see if that’s something that could be at play (ADHD leaving you overwhelmed/weak maybe? And the meds perk you up? I don’t actually know, though)