Can shingles disease pain (post herpetic neuralgia) affect the feet? 
The toes and bottom of the (left)foot to the heel seem to be affected.

Simply, yes.
Neuralgia -- or nerve pain -- comes in many different forms: It may be
sudden, shooting, sharp, burning, or stabbing, and is sometimes
accompanied by a background sensation of burning, itching, or aching,
or by hypersensitivity to touch. It occurs in one part of your body,
typically on one side. Postherpetic neuralgia follows the area that
was affected by the shingles along the distribution of the specific
nerve. The pain may come and go or be continuous. It can last for
days, weeks, or longer. If the left side of your body is more affected
by your shingles than say the right it would be logical for pain
associated with this disease to be more intense on the left side. Be
wary however, leg and/or foot pain that may not be associated with
shingles could be indicative of circulation or other nerve problems,
especially if you are diabetic. A quick call to your physician may be
wise. (sources: webmd.com, tager's medical reference)

lina2:

As a non-diabetic paraplegic, shingles and pressure ulcers are both
topics of experience with me.

The following descriptions are from personal experience. Please see
you doctor ASAP to confirm for treatment.

Shingles generally display iching, burning sensations in the early
stages with welts or red areas very obvious. These initial symtoms
progress to extremely painful, extremely itchy, welts. Shingles hurt
like the dickens.  There is treatment for shingles to reduce pain. 
Discoloration from shingle outbreaks can last for a considerable time.

Pressure sores are a very serious occurence. They often start out as a
itchy spot which may develop into a very small sore spot...Get it
taken care of right then..do not hesitate even a day... I
hesitated....bad shape..

See you docotor ASAP with either of these occurences...NOW

Good Luck
Seedyb