?I recovwermy facebook account iwas in a bad car crash n had a brain injury don't remember my pswd please help me.....

Feroza. Loosing a password is as bad as loosing the only key to your front door. Loosing equals forgotten. Facebook has a lot of ways to recover your account, but you should have left at least one email account where you still have access to, before you last connected to FB.
They even can send a reset pass word code to one of the first e-mail addresses you used to verify you were a real person and not a bot. Remember you had to open a mail and send back a number, or click a link while setting up your account.
I'm not sure you tried to get help from Facebook, but if not, go to this page and see if anything fits your situation, to recover your account.
Facebook Help Center Facebook

Uninstall the app and reinstall. Make sure to allow the phone to delete all saved data from the app. When you reinstall, you can use the correct information.

please don't ask people here how to hack facebook.

just log in to your email address that you used when you create your facebook account.
example if you used your yahoo email address when you created your facebook go to www.yahoo.com then log in to your yahoo account then go to inbox look for facebook confirmation and click it. thats it.

If you don't remember your password, enter your user name and then click on the "forgot password link" instead of entering a password. As long as you can answer your security questions created when you registered for your FaceBook account OR verify your identity they will help you reset your password and then you can change it to whatever you want it to be.

retrieve your password using your email.the same email you use to open a facebook account,request for a new verification password and follow the instructions.You can change your new password as soon as you received a verification code from facebook

Under the password box on facebook.com, there is a link that says 'forgot your password?' Click that and it will email you your password.

put the correct paaword hope you a forgot the pswd then try again it will works or reset the pswd