Mestinon often does little or nothing for vision issues. That is not uncommon. I think your doctor is wise to recommend the IVIG. It will help with the vision, most likely, as well as overall functioning.

Even though you had the surgery back in December, your body is likely still recovering and processing the stress. Also, since you're female (I assume) hormone fluctuations can cause a flare up of symptoms.

The 5 days of IVIG will be a big pain in the ... but it's worth a try to help. If you do get good results, that will be good to know for the future. You definitely need to be at optimum functioning with your heavy schedule!

Oh, and welcome to the forum!