Front camera not working / delayed sms

[Celticgal]

I'm sure I will sound like an idiot, but hopefully someone can help me. My HTC Evo 4G is stock, I have no idea how to root the phone or do anything special with it. For some reason my front facing camera isn't working. I have gone into settings and switched to front camera and the screen just goes black. The only button that works after that is the home key. I have to take the battery out in order to get the regular camera to work. Is there any way to fix this without bringing it to the store? Also, for some reason all of my texts have been really delayed lately. I will go 8 hours with zero text messages then all of a sudden 20 will come flooding in at once. I called Sprint and of course they are saying they have no idea what is causing that If anyone here can help, I would reeeeallly appreciate it! Thank you!!!