How to get rid of bed bugs?!

I have bed bugs n they R ***** annoying, I always wake up at like 4:30 am cuz of itching and then find 2-4 bite marks either from my leg or my arm, and i see the bed bug, only one at a time though, but even after cleaning the mattress and everything they still manage 2 survive! Also tried pest control in my room and I saw many dead bed bugs and after cleaning everything I thought finally I can sleep confortably, but....woke up with a bed bug, Will changing the mattress solve it?? I think its my room cuz I have 2 beds in my room, and even tht has bed bugs, both the beds are close to the wall, yes I even moved the bed away from the wall but still I find a bed bug, Oh and my family members slept in the my bed n they didnt get ny bites n didnt see any bed bugs, Why do they only bite me!!??? Yeh I'm unhygenic but so is my brother n he didnt see ny bed bugs, and wat attracts these bed bugs?? is it teh tiny bit of food crum on the bed or wat? This is a really big problem