All these symptom indicate that you might be having Computer Vision Syndrome
So...to get relief, you should avoid looking continuously at the screen.
Give rest to your eyes for 2 min in every half hour, splash cold
Also use sunglasses or goggles while going out in sun.
Another reason of concern may be due to different refractive power in both the eyes.
So...if the symptoms still persist, it will be better to consult your Ophthalmologist & get a refractory check done.
Wishing you good health & a speedy recovery.
Thanks and Take care.