One of the worst things to do when feeling anxious is to vacillate back and forth (ruminate) on a decision. There are a lot of skills to learn in order not to do this. Humor and in and are common approaches. If you've made the decision, you can learn to not get caught in a cycle of review and vascillation. Just like most people were taught in school- pick your best answer first. If really uncertain, move on and come back to it.