I really want to become a fireman but i have epilepsy so was wondering if i can have brain surgery ?

You should look into the risks and make sure that it is something that you really would like done. They do have procedures that can work to correct epilepsy, but these surgeries can be very dangerous and even after the surgery there is no guarantee that you will indeed be able to become a firefighter. Go to your doctor and ask them for details, if he/she believes you are a healthy candidate they should write you a referral or provide you with more information and point you in the right direction.