Feels Like Dust or Sand in Eye After Upper Eyelid Surgery

It sounds like you may have an abrasion of your eye.  This can happen and this is something you should mention to your surgeon.  He or she may want to put you on some drops until it resolves.

I would minimize rubbing or irritating your eyes.

Good luck.

There are several potential reasons for your symptoms. This can range from something minor to something more serious. Consult with your surgeon regarding this problem and perhaps request a consultation with a specialist for a more thorough evaluation. Without an evaluation, it is difficult to provide you spefics on your situation.

I agree. Most likely you have a corneal abrasion.  You should see your doctor as soon as possible, as the abrasion may become infected. 

It sounds like a corneal abrasion or irritation. It usually responds well to conservative measures.
If your surgeon cannot resolve this issue you may wish to be seen by an eye doctor.