Starting to wish I didn't apply to TEN programs. That's 10x times the anxiety! Could be 10 rejections, or if I have better luck, some really tough choices ahead of me.
I'm in a similar boat (change social psych for particle cosmo); I applied to 12 while paying attention to recommender connections and having a range of realistic options, 12 rejections will sting and I will have to re-think the whole strategy for next cycle, if any...
You'll have a decent idea by next month if you have a chance to get in. My SO is in the same boat. Uncertainty is good for neither of us. Last year by mid-Feb, I knew that I hadn't gotten any interviews.
As for all rejections, just remember, I know from experience that it doesn't actually kill you.