Does lower eyelid surgery causes strabismus?

I had an lower eyelid surgery about 3 weeks ago, and since then my left eye seems crooked, and it is not aligned with my right eye, and I look crossed eye. I'm scared to death over this, and am worried that maybe a muscle has been cut mistakenly!!! my doctor said that I need to give it at least another 3 weeks and that it is related to swelling of my left eye...Can somebody please help me as Im desperate to know what is going on...