Yes there are many cancer forums out there. Go to bing.com, the new microsoft search engine, plug in "cancer forums" and the first page lists loads of forums. I didn't look at any of them myself but they look like online communities such as this one for pain.
Hope that helps.
Degenerative disc disease since 1985, 4 back surgeries, fused from L2-S1, instrumentation. Being treated for chronic pain. Oxycodone 30 mg. IR.