If your hair needs trimming, get it done before the procedure. Avoid the risk of an errant hair clipping getting into your eyes. Any chemical treatments such as perms or colors should also be done before your procedure. Use the wetting solutions supplied by your doctor as often as you need to. Also, if you have used these wetting solutions and your eyes still feel dry, try wearing your sunglasses.
Light sensitivity can be confused with dry eyes - it feels very similar.
If your doctor says use Tylenol, he or she probably means Tylenol. If in doubt, ask your doctor. In fact, if you have concerns about anything at all, ask your doctor. That is why they are there, and most will be pleased to help you in any way they can. Relish and appreciate your new sight each day as it gets better and better.