Whey do my eyes feel tired and head feels heavy?
Your symptoms seem to be Sinus related. Does it also hurt if you try moving your eyes from side to side? Try taking an over-the-counter Allergy/Sinus Medication to relieve the sinus pressure and see if it improves. I have a feeling it will. Edit: I have read your additional details, but I still feel that what you're describing is sinus pressure. Feel Better.