Head trauma might be cause of your difficulty switching from near to far, which would not be fixable with repeat Lasik. Of course, there are other possibilities. I would recommend that you see a Lasik doctor for an evaluation.
Do yourself and see a surgeon who actually finished a fellowship in cornea/refractive surgery, it doesn't sound like these guys did as it is pretty obvious you are undercorrected and might need an enhancement, plus dry eyes so you probably should have already received punctal plugs and restasis...
You should be ok your flap can only move if you are within the 1st 3 days, if you had a PRK or LASEK you wouldn't have to worry about anything as there is no flap to dislodge:)
