Hello,I Was Diagnosed With Adhd About 5years Ago,am 64 Female.About

hello,I was diagnosed with adhd about 5years ago,am 64 female.About 1 year ago,Dr. took me off Adderall alsoXanax even though they were helping me a lot.Adderall10mg. 2daily Xanax1mg. 3daily. Dr.only said they could not prescribe those anymore,not for anybody.Changed me abruptly to 10mg.Ritilin,2 daily and 10mg. Valium 3 daily.They have a somewhat different affect on me,do not work for me as well at all. Can you tell me why my meds were changed like that?