Smitten.  According to dictionary.com the definition of smitten is as follows:
smite/smaɪt/ - smit; smit•ten or smit; smit•ing.
–verb (used with object)
1. to strike or hit hard, with or as with the hand, a stick, or other
weapon: She smote him on the back with her umbrella.
2. to deliver or deal (a blow, hit, etc.) by striking hard.
3. to strike down, injure, or slay: His sword had smitten thousands.
4. to afflict or attack with deadly or disastrous effect: smitten by polio.
5. to affect mentally or morally with a sudden pang: His conscience smote
him.
6. to affect suddenly and strongly with a specified feeling: They were
smitten with terror.
7. to impress favorably; charm; enamor: He was smitten by her charms.
–verb (used without object)

It has a more negative connotation than what people think when you hear the word smitten… and yet still SO appropriate, because usually when one is smitten it comes out of nowhere like someone hit you in the face with it (with rhinestone brass knucks).

I’ve only really been smitten maybe twice once… and that’s exactly what it was like.