My eye hurts from the outside & its alittle swollen. No pus or red eye jst sensitive to the light what can it be?

Eye issue. Your description sounds like ocular surface dryness causing your symptomology. I would try frequent artificial tears during the day, ointment at night, omega-3 fatty acid supplements, and warm lid compresses. You can also try avoiding fan, getting humidifiers, protective eyewear while outdoors, and others. If no improvement, punctal plugs or oth.