ahh, that's really unlucky. For reference next time, whenever you see red text, it's to warn you that where you're entering is potentially game ending territory, so you should keep a backup save.
When the enemy is about to put the parasite on your face, it'll show a certain text. If you guard when that happens, you can dodge the attack.
Also, if you do end up stuck, you can do a new game+, found in the sanctum. It'll start you over from the beginning, but keep your character and possessions.