I indeed just flashed the boot.img seperately which was in the rom, and now it works. It's a huge relief to see my phone work again, thanks a lot!!
One more thing so I avoid messing up in the future; When I decide to install another rom, do I always do a factory reset / clear cache, then flash the rom and flash the kernel via fasboot?
FULL wipe --> format system, data, cache, dalvik --> flash rom --> immediately go to fastboot and flash the kernel --> reboot and done
Just try to get S-OFF, then the kernel get installed with the rom via recovery