I think you should keep taking whey protein, but add some glutamine or creatine into your shopping list...from what I've read, it isn't too harmful. You should take small dosages though, just to be safe. If nothing happens, just increase your dosage after a while.
Bodybuilding.com - Glutamine Information and Product Listing! Glutamine FAQ!
I'm not a doctor though, so consult with your doctor and find out if it's safe to experiment with those supplements. (I think you experienced those side effects because you took too many supplements, lol).