I am 36 years old.when i wash my hair my head gets hot like fever.when i bend down to pick something it seems like something will fall down.i?

Flushing: The question is if you are developing a rash when you are applying the shampoo and having a contact dermatitis? What happens if you use the shampoo on other parts of your body? If no rash and you still feel this light-headed/dizzy feeling, then maybe the first stop should be a neurologist or your primary care doctor for further evaluation.