Although I agree that chiropractic care can be helpful for back strains, headaches, etc. I do not support the idea of seeking out chiropractic care until you have ruled out more serious causes, primarily because of the level of pain that you describe.
Some other thoughts that came to mind... Do you have pain upon flexing your foot? Bending over?
Also, what were the circumstances surrounding when your pain began?
I look forward to your response!
Please let me know if you have any additional questions. I am more then happy to be of assistance.