I tried eating proteins, exercise a bit and take a nap but i cant concentrate.could there be something wrong?

Sometimes your mind gets over worked you need a break if you can get away from there for a day or two and get as much rest as you can. But usually just getting away somewhere else where you can relax will do it. Or it will get worse to much stress and being over worked isn't good everybody needs to get away from it all for awhile. In other words your brain gets bored!