I have found something else that works for the anxiety: running. It's better than bike riding, even when riding 20 miles to work. I think it's because running is more physically challenging. Running makes me out of breath no matter how slow I go, bike riding doesn't. When on the bike I have to go faster than my average pace, I have to push, to get my heart rate up.
The only trouble with exercise is that it's hard to do it. Taking a pill is easy.