Unfortunately most chain pet stores are known for not having well cared for snakes, and this is a common occurrence with snakes bought from them. I suggest leaving the snake alone for atleast 5 days before attempting another feeding, and only attempt 5 days between failed attempts to feed, its quite possible the snake is just stressed out from to many feeding attempts.
This is my first suggestion, after 5 days of no handling, place the snake in a small container with a lid, and place the pinky in the container with the snake. Place the snake in a dark room, (Like a cabinet, or a closet) and leave it in there overnight. That way the snake feels secure, and not nervous about eating.
If this suggestion doesn't work, wait another few days and check out my article on problem feeders.
Remember, baby corns can go a very long time without eating, and since you just got it on valentines day, its no where near deathly ill.
http://cornsnakes.com/forums/showthread.php?t=42403
Anymore questions, just let me know.