This definitely affected me. I had 8 in september, canceled one in october, and have 3 more in december. I definitely burnt out and acted a little strange towards the end of september. I dealt with it by partying HARD when I was home and done with a big week of traveling. I spent a lot of time doing whatever I wanted, because I had been putting on a show for weeks and it was burning me out. you really realize how much BS is behind this process, especially interviews. I feel you and don't know what to say other than do your best, don't forget to take care of you, and relax when you can. No one can tell you what to do with your non-premed time except you.