nerve biopsy not worth it

I had a sural nerve & muscle biopsy 4 weeks ago. Helped with diagnosis but 8 days after the biopsy I began having severe pain below the site of the nerve biopsy on the side to top of my foot surging into my 3 outer toes. This was unbearable, became some better after about 10 days but still have tingling & electric sensations on the side of my foot (outside middle) this has been tormenting. I wish I never had the nerve biopsy. No problems at all from the muscle biopsy in my thigh. I would never want anyone to suffer from this it is not worth it. I have CIDP and that is bad enough without this added torment.