Please don't worry about this at all. Take it from me. Back in March I too noticed that my pupils were different sizes and started freaking out. Half my face would feel numb for entire days. I would feel dizzy as well, not to mention the tons of other symptoms I had that to me meant a definite brain tumor. Well guess what. I had an MRI and it was all clear. All it takes is for you to notice one thing, that actually means nothing, only for you to associate with something terrible and it's all downhill from there. I know all about the feeling. Your pupils very well may be different sizes as mine actually are, but 1 in 5 people in the general population just seem to have it. That's twice the occurrence of being left handed! It's so very common, but the differences are usually so small that you only notice it on yourself if you notice it at all.