What should i do with my iphone 4? - 1

Ok so i went into a hotub with my iphone 4 for around 10 mins, i thought it was dead for sure but i left it for 2 days in rice and it started working except for my lock button at the top of the phone, so instead of using that i got assistive touch in the settings to lock my phone, anyways the last past month, my phone has always been hot, and takes a ling time to charge to 100% and it dies really fast now too. So i looked it uo and it said to put it in a cold room and to turn it off, unfortunately i can't turn it off cause then i can't turn it back on because the lock button doesn't work… What should i do i'm so confused.

Get a new one, like the the iPhone 5!

You could try turning it off. When you plug it in to charge, it automatically turns back on.
And the thing about water damage is that it causes permanent damage. You may have an upgrade, so this would be a good time to switch to a new iPhone.

Don't get iphone 5 it costs more not even with the little bit faster internet, cases cost more, and you need new dock connectors.