Wifi problems no IP, not connected to internet

I have some problems connecting to the internet via wi-fi.
First internet becomes very very slow for like couple of hours, so slow that it takes like 5 minutes to load a page... then at some point it just disconnects me from the internet. When im trying to connect back to it the connection times out and if i go to network preferences its written there that my mac doesnt have an IP adress and i wont be able to connect to the internet. Then after a while its shows that im connected again to my connection, but it just doesnt load any pages...
The strangest thing is that only my macbook is having this problem (it totally works on my notebook that i was using before i bought my mac, plus there are 3 more ppl using that connection and they dont have any problems).
First it happened like 2 weeks ago and i spent like hours trying to figure out what to do. In the end i just got really stressed and ****** and left my macbook for 2 days without even touching it.. after that i was thinking to bring it to the Mac shop so that they can help me to solve this problem and just to try, to make sure it still doesnt work i turned on my mac and it was working again without any problems! Until yesterday!! Was exactly the same script : mac got slow, then it disconnected from internet at all, then timing out the connection and no IP adress and finally, connected, but not loading any pages!!! Today all day long it switches between no ip and connected but not working. ITS REALLY FRUSTRATING!!! Im connected now using ethernet with cable, but its really not comfortable like that and i would love to solve this problem.. ANY IDEAS??  

Doesnt help

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