Are you looking at your lists as often as you need to? To get rid of the anxiety, it's not enough to write everything down. It needs to be where you'll see it in the appropriate context; and, more importantly, you need to have the habit of looking at your lists on a regular basis. Otherwise, written down or not, you're still keeping stuff in your head.
Once you make a habit of looking at your @Computer list whenver you're at a computer, your brain will know there's a trusted system in place -- and only then will it let go of your open loops. You can't fool yourself on this one: your brain will continue to manage your unfinished business until it knows there's a better system to manage it than psychic RAM.
Personally I've found that when it comes to reviewing project and action lists, it's better to risk overdoing it at the beginning. Make it a point to look at your action list whenever you change contexts.