I had LASIK 5 days ago and now am suffering from a headache and blurry vision why?

This is certainly not a typical side effect of LASIK.  It would be prudent to check with your surgeon and your primary care doctor.   It is possible you either are over-corrected or over-responded to the vision correction and are now farsighted forcing you to accommodate and strain your eyes.  This can possibly cause a headache.