Touch Pro Battery Issue - HELP!!

[freaKs]

My phone charged ALL NIGHT. I come to work, and plug it into my work PC via the usb cable directly from the PC.

now, I am getting "Main Battery Too Low" message, and my phone is shutting itself off, as well as a screen which randomly turns off and on every minute or so. Whats the deal here? Keep in mind, my phone charged all night, just like every night beside my bed. Which I usually get a whole day worth of battery life. This is very frustrating, and making me re-think if this $400 I spent on this phone and switchd from a BlackBerry 8330 Curve, was worth it.