Dear Fiona I,
for the last three years, at my regular diabetic checks I also have been experiencing a similar problem with a weak pulse in both feet (particularly my left foot). Like you the nurse dosen't seen overly concerned over this, even despite my telling her of the coldness that I also experience in both my feet, particularly so when sitting for some time and not moving.
The only advice I was given was to carefully examine my feet on a daily basis, as loss of blood flow could contribute to a loss of nerve sensitivity. If there is any simple answer to this problem I would also like to know what it is.
On a slightly different issue, several years ago I suffered with 'pins and needles' in both feet to the extent that it would keep me awake during most of the night. Having waited over a year for the NHS to investigate this problem, I decided in desperation to try 'Evening Primrose Oil with Vitamin E' as a possible solution. I can report that in my case I found that after using this herbal remedy for a week or two the 'pins and needles' vanished and have never returned since then.