Strype, don't be scared of creatine lol. You just have to stay hydrated throughout the day and not have a problem. Same thing with an increased protein uptake, you have to keep hydrated (Same thing to LIVE, you have to stay hydrated, see what I'm gettin at?).
Anyway, creatine does in fact work. The problem comes with varying body types. Your muscles can only hold or retain so much creatine, also your body can only produce so much creatine. A perfect candidate for creatine supplementation would be someone whose muscle can hold more creatine, and their bodies don't produce enough creatine ot begin with. On the other hand, if your body produces enough creatine to supply your muscle, creatine supplementation will and won't work for you (We call these types 'nonresponders', as they do not respond to an increased creatine uptake).
There is hope for no responders (I said supplementing WILL or wont work, remember?) and it comes in form of creatine. Creatine Monohydrate, the most basic form of creatine, should be tried first. If you are a 'responder', you will notice within a few days that your muscles are fuller and your strength increases slightly. If you are a 'nonresponder' you wont notice much of a change at all. Non responders can resort too CEE, or Creatine Ethel Ester (such as BSN NO Xplode, or Labrada Supercharge). CEE will not only supply you with extra creatine, but it absobs differently (not as effectively, although) so nonresponders can feel the benefits of creatine.
On another note, I don't see how your body could ever get used to protein. I can understand you might get sick and tired of the same company's product, but I don't see how your body could ever become immune to protein absorbtion? And even if you could, how would changing the company fix the problem? its the same basic thing, protein?