Dont worry. Do this. First use the wall charger and charge your phone for at least 30mins. So if your phone is off then it will charge till 70-80%. Check if it is charging by looking at the micro-usb port lighting up.
Now go to the White triangle with ! mark. Then press @ button. You will get options. Select erase data by pressing volume button and then clicking enter button on your keypad.
After the wipe has been done pull out battery. Then start RSD Lite on your computer. Put the battery to your phone. Now press both volume up and volume down together and then power button for 2secs. Leave power button. You will see it in bootloader.
Now load sbf file on RSD software and wait for it to recognize your phone. Then click start. Thats it. Your phone should be ok.