I quite agree with Dr Por. You should have a proper eye check first, including a refraction test to check your eye power to see if indeed it is overcorrection, or even undercorrection. Hopefully it is not significant under- or over-correction, as enhancement is a bit trickier following SMILE and you may have to consider either LASIK or surface ablation as enhancement options if really necessary.
In my experience as a SMILE surgeon, in general it is more likely to be under than over corrected.
However, the fact that you sight is fluctuating makes me wonder if you are in fact experiencing some post-SMILE dry eyes. Even though SMILE induces less dry eyes after surgery than LASIK, usually patients will still need some dry eye treatment following surgery. Do rest your eyes more and continue with your lubricating drops.
Hope it turns out alright! Cheerio!
Dr Han
