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(Мне) хочется выкинуть все мысли из головы or (Я) хочу... It's better to not use я or мне, to my tastes at least. I also think you can substitute выкинуть with выбросить, the first is probably more...

Well, if you just realized that your brain wasn't working properly, then yes. Your translation seems a perfect fit.

If it's been the case for a while now, then it's better to say:

мозги не...