I feel cold, anxious, sweaty, sleepy, and too weak to stand. i have a bad headache as well. is it hypoglycemia, if it didn't improve after dinner?

Unlikely to be: hypoglycemia, unless you take insulin and manage to get low sugars from a full meal. These symptoms are not really specific for anything, except maybe 1) pregnancy and 2) low blood pressure, which could either be from pregnancy or medications or poor nutrition/dehydration/ lack of exercise/ circulation problems. Check a pregnancy test and check your blood pressure.