Can you get into download mode? If so, you should be able to flash the phone back to stock. Granted, you'll wipe the phone clean in the process, but that's preferable to having a glowing brick right?
Anyway if you Google "flash G2 to stock", the first result should be an XDA thread dedicated to helping you out with the entire process.
Sent from CAMACHO, my Verizon G2 (VS980) running PAC ROM 4.3.
The Aphotic Chaotic
LG G2 VS980 (Verizon) [JB 4.3] PAC-man ROM
Nexus 7 [JB 4.2.2] XenonHD