Hi ! Have you seen a rheumatologist and neurologist yet ? If not, I would consider speaking to your primary care physician and getting a referral. One thing you may want to also find out is whether or not your numbness and overall pain could be related to your back pain.
I can tell you that MedHelp is having some upcoming live health chats with health care professionals. There will be live discussion on chiropractic care and if you are interested, you can join the chat and ask your questions. Here is the information:
April 9: Adam Tanase, D.C. on Chiropractic Care
To learn more and register for any of these health chats, visit:
http://www.medhelp.org/health_chats/list_upcoming