Don't hachet your Counts before they chicken, just because you'll be 18. If you're still going to be living with your parents and/or going to school or under their health insurance, etc. I wouldn't dismiss your mother out-of-hand.

Is there more/less of a problem with one or the other of the pain meds? Could you do without one or with different ones so you could try some other med? Maybe your pdoc could back you off the Depakoke a little and that would work as well but not have such effect in the flat department? I'd ingratiate yourself to your pdoc (be polite and "concerned" with your condition and get your T to help you come up with "reasons" why the Depakote is not a good idea for your healing right now) and see if he could try a bit harder, next time you see him. Or, see if your T will call him and talk with him and/or your mother and get them being more helpful?