Originally Posted by Jade Dragon
Yes, yes you are. Boosts are activated as swift actions. Swift actions eat up your immediate actions. It takes an immediate action to use a counter.
I think you've got it backwards. Immediate actions eat up your swift actions. If you use an immediate action on your turn, it counts as your swift action that turn. If you use an immediate action out of your turn, it eats up your *next* swift action.
Using a swift action on your turn has no effect on whether or not you can use an immediate action later.