I recommend seeing an ophthalmologist specializing in dry eye disease. They have tests for measuring tear breakup time (TBUT) and imaging equipment for viewing meibomian glands, which are specialized sebum glands that coat the eye surface in oil to form the tear film. Fish oil helps for that reason - Omega-3s improve sebum quality.
Personally I use preservative-free eye drops with hyaluronic acid [1] and they help out tremendously. I also use a heated dry eye mask, but I don't know if that helps with Lasik cases.
But it's best to try to treat it sooner rather than later. I ended up seeing my ophthalmologist in the first place because my cornea got damaged and infected, and he said that the eye dryness could have been a contributing factor.