What causes indeciveness?

i used to be pretty indecisive, but in the end i could always make a decision. these past few weeks it's increased so much. i can't make even the smallest decision. i stood at the jack in the box menu for like 5 mins. just because i couldn't decide between 2 things. i finally asked someone else to make the decision for me. it's just like a mental block, i mean, i CAN'T make a decision, no matter how bad i want to. what causes this??