The solution is fairly stupidly simple; take your mind off of everything. Play an internet game that you could play for hours. It will help you go on through your day and maybe give you something to look forward to. I also think it would help you to reserve a little bit of time to reflect upon your thoughts. Learn to trust yourself more often. Try your best to be confident in what you think. But my best tip would be to just get your mind off the situation.

I hope this helps.