Colts,
Angina symptoms are typically brought on by activity. I am concerned that you might not actually be having angina. Furthermore, if you are having angina daily, you really should be on a long-acting nitro like Imdur or Isordil.
The nitro pill you're taking often makes people feel lightheaded because it drops the blood pressure. You may want to check the blood pressure before you take the pill -- this would also be helpful to your physician. If your systolic is less than 110, then taking the nitro might really make you feel bad.
Here is a link on chronic stable angina (which is what you have):
http://www.nlm.nih.gov/medlineplus/ency/article/000198.htm
Regards....
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