Your doctor is giving you sound advice, including staying on clonidine alone if it works as well as it is now...
I would find a qualified physician to answer my questions and concerns. I take over 17 drugs daily with no ill effects. I take Klonopin, Methadone, Norco, inject Toradol, Requip, Trazadone, etc., just to name a few.
I was in a head on collision in 2002 and still receive selective nerve root injections and epidurals ever few months.
I don't know the answer but I would get one from my doctor or a professional specialist.
Peace,
Donald