How can I find my bitcoin wallet?
Unfortunately once you lose your wallet, there is no way of getting it back. 

The wallet is so inportant because it contains your private key, this key is used to send money from your wallet to other people. Without it you can't do anything.

Next time consider writing down the private key and keep it locked up, or keep an offline version of your wallet.dat file. however be careful with keeping online versions, since anyone who has your private key can send money anywhere.

Just for clarity, you talk about your 'adress', is this your public or your private key? With other words, did you use it to send money? Or to recieve money?