I've been following this thread with great interest.

It does show that color changes, of a severe nature are important symptoms of vascular problems.

I have a few comments to consider. Nifedipine has a down side, and that is why it is no longer commonly used for blood pressure.
It can cause overgrowth of the gums over time. So at one point long term side effects may appear for you. Long term use of calcium channel blockers has been linked to cardiomyopathy too. Nifedipine may also affect platelets.

Use of a long acting nitrate may work, or topical nitroglycerin in ointment form if nifedipine needs to be changed. However nitro has a tolerance feature which over time the body fails to respond as it did in the beginning. Imdur is the typical oral form to try in any event.


Secondly there are supplements when taken as directed can be as strong as nifedipine. L-arginine and L-citrulline can dilate vessels as well, without the side effects of RX drugs.
http://healthiswealth.net/index.php?.../Nitric_Oxide/

These have to be taken rather aggressively to work.

There is also a reduced dose Viagra made for blood vessel dilation. It was designed for primary pulmonary hypertension, but it may work on your feet and legs too.

http://www.revatio.com/
This would need to be discussed with your doctor, if nifedipine starts causing you long term problems. This may not be a covered benefit on your insurance. May have to get a prior authorization, etc.

Anyone with circulatory problems I'd get checked for homocysteine levels, and C-reactive protein. What is going on in your legs may be going on elsewhere too. Antioxidants can help with circulation/inflammation, and Vit C and quality curcumin have shown positive effects on the linings of arteries in studies.

This is a very good thread, and I am going to link to it in our Subforum here.