I had Lasik surgery 2 1/2 weeks ago. I have now got floaters in my right eye. I did not have them before the surgery.

The average time to heal after Laser Vision correction is 3 months. Coming to any conclusion before it won't be a good idea. During Laser Vision Correction the suction pressure might be high that causes changes in the vitreous gel. Kindly get your retina evaluated. Use prescribed lubricating drops on time. 

With a new onset of floaters, flashing lights, and especially a blind spot I would recommend that you see an Ophthalmologist immediately to have your retina evaluated. These can be signs of a retinal detachment. This can occur with any eye surgery but is very uncommonly due to the lasik surgery itself although individuals seeking lasik often have myopia which puts them at higher risk of retinal detachment even without surgery.