I'd suggest you try the new Morton's Epsom Lotion (magnesium).
This might help your circulation in the feet. Also it dampens pain and swelling, by blocking NMDA pain receptors.

Not expensive and only at WalMart so far, and Amazon.

Many of us use it here. Apply a quarter's diameter dollop divided into 1/2 for each foot. Apply on the top of the toes, top of the foot and around the ankle on each foot.

http://www.mortonsalt.com/for-your-h...-epsom-lotion/

This is not in all stores yet. It has only been out for a few months.

PN from nitrofurantoin is "supposed" to resolve with time. Your extended use may make a difference however.

I'd really test this out...the lotion...as it provides needed magnesium to the body (which typically is low in most people) and is very inexpensive to boot.