8 km walking and not eating well causes weakness, now 3 months after eating well my weakness gone, but some problems not gone like mild headache, dry eyes dry eyelid, i can not do exercise or cycling because if i do feeling head fatigue, if i miss my meal feeling head fatigue, mild heart sensation and irritating eyes and mil headache, i have consult eye doctor he says I don't have eye problem, what to do plz tell me, my mild left neck left top of the head, mild eye pain, which doctor i have to consult and which test i have to do plz help...