Nose is stuffy, headache at top of my head and in my eyes making me fatigued. wondering this could be related to allergy or sinusitis?

Both: If its allergy , can cause all the complaints so go see an allergist , to have ctscan of sinuses asap , get treatment and then later on skin test very important to avoid future problem might be acute sinus infection then antibiotic and steroid for 5 days.

Either: Could be either or both. Try over the counter allergy meds, if no improvement see a doctor.