OCD or just crazy?

I don't understand it, I just don't. Or maybe I understand it all too well. Either way, my problem is that my brain seems to be against me. It comes up with formulas, theories, and reasons for why things happen that I don't want it to. It seems to combine mathematics, reasoning, and science whenever something bad happens too me, and it tries to convince me to believe it. The previous week, I was getting good grades (A's and even a few 100's) in all of my classes, but I was unhappy because I was still in 4th period lunch. All of my friends were in 5th period, and everyday I had to invent a new way of wasting 50 minutes of my time without getting bored. This week, I finally got the guts to ask my counselor for a switch, and now I'm in 5th period lunch. Today was the first day of 5th period lunch, and it was amazing. It was just like the old days of middle school, before lunch schedules. However, to my shock I got an E on a Spanish test and an C on my science test. After finding this out, my brain is trying to convince me that the cause is that I'm too spread out. It tells me that to be better at school, I need to be worse at something else. However, I think I'm beginning to see logic behind this, and I'm scared that this might actually be my case and that if I don't become worse at something else, I'll never get A's in school again.

Well, you're alluding to a good point here, which is that we only have a certain amount of time to spend focussing on different things. For example, I put most of my time into my academic abilities, which means that my social skills are waning again. What is 'period lunch' though? We don't use that term here