Hamster suddenly strange?

After my hamster had a spazz attack last night(it was so scary. it was jumping and trying to get out of the cage and running like crazy, like this: http://www.youtube.com/watch?v=70I5mOsbGvQ ). i didn't know what happened next because i had to go to sleep... it was 2am XP. but when i woke up and checked on him, he's always in his igloo. i've never seen him in it before. he never came out and when i hand him food, he just takes it and goes back into his igloo. i never seen him act like this. he usually take it and eat the food next to my hand. and i noticed that his got bigger and is pink o_o" and then he always makes this noise with his teeth... idk why... it looks like hes scared or something and i thought his memory got killed(not literally) or something because its like he doesn't know me o_o... what wrong with him?