Your symptoms point to digital eye strain and temporary dry eyes from prolonged screen use. Since you wear -3.0 D glasses, close-up mobile use can easily fatigue your eye muscles. For immediate relief, I recommend over-the-counter preservative-free lubricating eye drops (artificial tears) used 3 to 4 times daily. Additionally, practice the 20-20-20 rule: every 20 minutes, look at something 20 feet away for at least 20 seconds to relax your focus. Ensure your screen brightness is adjusted and blink frequently. If blurry vision persists after resting, please consult an eye specialist to verify if your prescription needs adjusting.