Re: pins and needles in legs, feet and abdomen
Pins and needles is one of many nerve pain symptoms that indicates a loss of function in the sensory nerve or nerves. Symptoms range from a tingling, to feelings of electrical shock, a feeling of water running down the leg, or pain that is harp, stabbing, dull, achy, to partial or complete numbness.
Did you have a MRI to diagnose the L5 herniation? I would suggest that if you have some nerve compression coming from this herniation, it may be that the herniation has enlarged, or there is swelling or irritation of the nerve which is responsible for the slight change in symptoms you are experiencing.
It is not uncommon to have pain in the pelvic area,groin, genital area, buttocks, etc. from an injury involving the L5 and S1 spinal nerves. I would suspect that the tingling around your belly button is most likely a sensitivity coming from this issue.
I've found that once there is nerve irritation, all my nerves, in general just feel more sensitive...
I would be a bit cautious with your visits to the chiropractor. Some treatments have been known to make some spinal conditions worse.