mouse is really important on fps games

i have a mouse 'toshiba' and it is broken today. the left button doesn't click and it makes it impossible to play. So i changed into another mouse 'intex', whoa, really confusing to play. The size is different, sensitivity is also different, and also the main thing, feeling is different too. I get bad scores and I get a headache using this mouse but i have no any ideas. Buying takes time. I have to master this mouse (than the gun) or get the same one.

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