Regarding Vision. Increase my eyesight?

I am 19 years old.I started wearing spectacles with a Prescription of cylindrical power only of -0.5D in Right Eye and -0.25D in Left Eye.Both eyes have cylindrical Power only. I've a kind off a burning sensation in my eyes these days when working on a screen. Doctor told me to use lubricants so I'm using Carboxymethylcellulose Eye Drops IP and Patanjali Drishti Eye drops.I have a mild headache these days but it's just around the right eyebrow and not the left one.I wear the specs and I get the pain,removing the specs gives me relief.Sometimes when I am not wearing the specs I get the pain and then wearing the specs gives me a relief.But it usually happens when I am working on a screen like Mobile or Laptop.I have sinusitis too.But I don't know,I get the headache mostly only while working on the screen and not when not working. 1. Should I wear specs all the time? 2. Or I should wear only when I feel the need? 3. Not wearing the specs all the time can increase my eyesight? Kindly Help