You can remove the PH zip file from the SD card via your pc if you have the correct card reader and while you're at it, place the rom zip file in the root of the SD card. You can then proceed to put the SD card back in your phone and flash the rom via recovery like you first intended to.
OR (if you have no way of accessing the micro SD)
you can just remove the card and do a fresh RUU as described below. You will still need to remove the PH zip file at some point once you're booted back into android after reverting to stock.
STEPS to flashing the RUU:
Connect your phone to your PC via USB and either power it on or select fastboot from your bootloader selection screen.
in windows CMD type "fastboot oem lock" once you are in the appropriate folder for fastboot and ADB.
Upon lock success we can proceed to install the official RUU file and return your phone to stock. Ignore any failed or security warnings following the successful lock message as it is natural.
Download the current official RUU from this post LINK
run the exe once downloaded and make your way through all the promps. Flashing the RUU takes 2-3 minutes and will update you on the progress via your phones touch screen.
When you unlock your phone again, I suggest dodging CWM Recovery and Clockwork mod all together. I'm not saying CWM Recovery is bad, but the bugs reported with it's usage is pretty high at the current unofficial release state.
Unlock your phone (much simpler process now that you already have the unlock_code.bin.)
One Click root your phone
Install Amon Ra Recovery
Make a nand back up
flash a ROM.
I guess keeping your roms zipped should be added, but I think you know that now.
Obviously there are other routes that can be taken, but this is a simple method or fix.