36, blurry vision years after LASIK, could I get it twice & when?

Hello, I had Lasik 6 years ago; it went perfectly. I had 20/20 vision with the only problem of double vision when driving at night. Since the last 7 months, I have been needing glasses again for distance, with a measurement of -1 in both eyes. I've had myopia since I was 8 years old. When I had the surgery, I had -6.5 in my right eye and -5.5 in my left, and a little astigmatism. I am only 36, so I'm afraid of losing more of my vision. Could I get LASIK twice, and when should I do it?