Hello,
Heaviness of eyes ,sometimes with headache is also an indication of eye strain. Check your eyesight (refraction) . If you have to work with laptop for several hours, that adds to the problem.
Next Steps
Avoid all kinds of screens(laptop,tv, phone) for a few days. Use refresh tears eyedrop six times a day.
Health Tips
Check your eyesight ,after a week of rest from screens.