Well, the good news is that your diabetes appears to be quite mild. With those A1C values, your average blood sugar is probably in the 120-130 range. Nevertheless, I would still recommend seeing a registered dietician to work out adiet plan. Check out the following links about food choices (they are from women's health newsletters, but they apply equally to men):
Spring 2004 Newsletter - Up Front
http://womenshealth.med.ucla.edu/community/newsletter/NewsletterWinterSpring2005.pdf
Your medications are reasonable:
Crestor 25 mg
Lisinopril/HCTZ 20/25 mg
Aspirin 81 mg
You did not list a beta blocker, however. Drugs such as carvedilol (coreg), may actually improve the pump function of your heart. Your cardiologist may have a good reason for not giving it to you, but it wouldn't hurt to ask.
Fish oil may also help with your heart condition, so you can ask him about that as well.
Your echo results imply you have an OK but borderline EF with moderate to severe mitral valve regurgitation (basically, the valve doesn't close properly when it should and your heart pumps part of its blood in the wrong direction, making it less efficient). Ask your cardiologist if he thinks that repair or replacing this valve would improve your CHF. In addition to the report, he might want to take a look at the actual images from the echo (you can usually obtain them on a CD). E.g., sometimes, one can see how the leaflets of the valve are moving.
Going back to your initial question:
-At this stage, your diabetes is mild and well controlled, making it unlikely that it would significantly increase your risk of yeast infections.
-Your symptoms of mild burning are probably not a yeast infection. But, if you like, you could take an empirical approach, steal some of your wife's monistat and apply it to the area... then see if it improves.
-The presense of a foreskin shouldn't really matter to you or your doctor.
-The burning feeling you describe may also have neurological causes (nerve damage/compression from spinal stenosis affecting the sacral nerves going to the penile area)