Iget shaky/nervous and dizzy when i skip a meal.same happens in stressful situation at work etc.pls tell me if not thyroid what could be causing this?

Two issues?: The latter issue you described could be part of your stress response during stressful situations. The former could be reactive hypoglycemia - very common when you eat a meal with a higher sugar content and then don't eat for a while; the blood sugar falls giving you symptoms. Not dangerous, but doesn't feel very good. This could be what's going on.