Hyperthyroid is absolutely not transferable....you don't have an infectious disease
TSH is a measure of the message going to your thyroid to make my hormones. When it's screwed up as in our cases on this forum, very low, it means the thyroid is overproducing hormones and we feel jittery.
Please don't worry about kissing your children or eating with others. You will stress yourself further. You want to reduce your stress as much as possible as it makes everything far worse.