Well.. i never heard that weed interfered with anesthesies... good to know... anyway... i think there is a greater chance of you get a "profissional" answer by some doctor if you post it in the "Medicinal Cannabis and Health" sub-forum. There is several doctors who post there, so they may help you.
Anyway, good luck, and i hope that everything goes well to you.
My best wishes! :thumbsup: