I second Wave's opinion. Go find another doctor ASAP. Your leg & foot problem should not be ignored by any doctor.
People with diabetes can develop many different foot problems. Even ordinary problems can get worse and lead to serious complications.
Foot problems most often happen when there is nerve damage, also called neuropathy, which results in loss of feeling in your feet. Poor blood flow or changes in the shape of your feet or toes may also cause problems.
It appears your doctor has no concern for your well being. Isn't there another doctor you can see such as one in the Palomar Medical Center?