Eyelids feel heavy and eyesight got blurry after using a lot of artificial tears. .. How can I cure it? I'm desperate for it to go away

See eye doctor. Beware of the fact that if you use tear preparation containing a preservative more than 4 x daily, you are likely to end up with corneal edema (blurred vision) because of the irritation. If you are using multidose drops, try the single-use kind and see if this helps. If this doesn't, check with your eye doctor (not optometrist).