Sativex is still not available in the USA, but hopefully soon the FDA pushed it straight to 3 stage trials Jan '08.  I am however taking Marinol for my MS and it helps, but still not the total answer.  I have severe problems with Neuropathy, Muscle Spasms and Chronic pain and started the Marinol (15mg to 20mg/day)recently and seems to reduce it and causes further drowsiness.  I prefer it over the lyrica, zanaflex and ultram I have been taking, but still need the Ultram sometimes when it gets too severe.  BTW Once Sativex gets approved they are planning on trying it over the Marinol.   All I can say is you just need to find a good doctor willing to work with you I have some of the top Beverly Hills docs and they help much more than others.