Q: My phone froze and now it won't turn back on after a day and a half!

I need help! My iPhone 4 froze on me so I turned it off, well now it won't come back on.  I plug it in to see if it will turn on and it doesn't. It will vibrate like it's charging but it doesn't do anything else.  It's done this before but it's turned on not long after I would plug it in but it won't now.  What should I do?!  I really need my phone!  I've looked up how to try to fix it but my power button is broke so I do it like that!