What could be wrong with me?

I am in no way a doctor nor am i going to prescribe something like that for you. However I have the same symptomes and have been taking claritin or any other type of allergy medicine early in the morning. I switched to a vegetarian diet. I excercise. I try to eat right. I take two advil at night to ease headaches. I also drink chamomile tea at night to soothe and relax without medicine involved. Also how old are you? Are you underweight? I am young and underweight and am constantly losing hair and being cold and having headaches. Also your thyroid might be slightly off. Some of the symptoms are : cold hands, losing hair, hard to gain or lose weight, headaches, naseau. And it generally just messes with your body. I would recommend just going to the doctor and getting tested for things. Try not to leave out any symptoms or problems you might have.