Can headaches & pains n your head cause brain swelling or cause problems like this. All my test have came back normal but I'm still worried!

You got it backwards. Burning the toast doesn't cause your toaster to be too hot; the toaster being too hot burns the toast. Brain swelling CAUSES headaches, not vice versa. Also seizures, coma & death. If your tests don't show it, you don't have it. Knowledge is better than fearful ignorance. Read up on cerebral edema's causes, symptoms and signs so you can put your mind at ease about it.