FEEL ILL ALL THE TIME

hi im 21 years onld n feel like im 99 years old.... my doctor told me i had anxeiety about 6 months ago. but lateley i have strong headaches simelar to sinus headaches n i have nasea n feel really hot n my complexion turn yellowey rather that pail this only happens wen i get these feelings the rest of the time im pailish..i dont know what it is i feel tired all the time also.. n wen i get this feeling it feels like im not here like im in someone elses body i know it sounds strange but any comments or people with similar experiances please let me know. i dont know whats wrong wi me but i feel its more than anxeity..
thank you.

I HAVE HAD PRETTY MUCH THE SAME PROBLEM FOR SIX YEARS. DOCTORS TELL ME THERE IS NOTHING WRONG WITH ME. I BEG TO DIFFER. I ALWAYS FEEL IN A FOG, ALWAYS NAUSEA, HEADACHE , MUSCLE TENSION.IT IS TERRIBLE.JUST WANTED TO LET YOU KNOW YOU ARE NOT ALONE.GOOD LUCK

yeah its horrible epecially wen u know theres more too it but now mines getting worse i feel sick n having pains in my abdomen like period pains n a tightening by my right side at bottom of ribs it feels like someone blowing a baloon up in there.