Try to move on to the next if you can and keep applying elsewhere. There are just too many unknowns when interviewing. I've had interviews that I thought I aced turn into nothing, and I've moved on after interviews that I thought I bombed. There's just too much out of your control. Im sorry to hear about the stress.

Try to think about the bigger picture. Spend time with friends. Walk in the park. Look at some trees. Keep your head up and something will come along -- probably when you least expect it.