I Have Issues W/ Binge Eating & Was Told That

I have issues w/ binge eating & was told that vyvanse was a decent medicine to treat my cravings & issues w/ over eating. Is there a way I can get a referral or prescription online for this kind of medication? I was prescribed adderall years ago for ADHD which I've since "grown out" of but the vyvanse has a longer half life in the body & seems a better solution.