I got interviewed by my top choice for a Ph.D. program and pretty early on, 4 interviews in 4 days (14-17th January, 2018), I'd like to think that's a good thing, because they seemed interested, but now I'm freaking out since I've not heard anything for the past one week. I keep going over the interview again and again in my head and feel like I gave a wrong answer to everything. By this point, I'm pretty sure that they didn't like me and that I won't get an accept. Does anybody here feel the same way? How was your wait post-interview and during the time of radio silence?