Constant headache and forgetfullness.

I have been having constant headache for so long which has also affected my eyes sight, i tend to miss figures together, forget easily cant concentrate completely. I feel pay all over my body most time and my back especially. I get so anxious easily and tensed up unnecessarily and each time i get so tensed i cant be myself again. I get so afraid for nothing. Sometimes when walking i feel like falling down and miscalculating my step. At times i feel my body is shaking especially my hand, right now i wanted to write sometime but i just forgot but will remember later. Sometimes my head breathes like a breathing movement besides and at the back of my head. When eating i tend to rush my food, if i perceive food it runs through my head and it affects me. I am allergic to dust, smoke and some chemicals. Please help me i am 28yrs old