Oh, man. I'm glad you are okay. The trauma from even the most minor of bike crashes can be unsettling. I use Bach's rescue remedy (flower essences) tincture for any form of shakeup - I'm sure there are plenty of 5-element Chinese Medicine practitioners that might be able to set you up with some herbal mixtures, if you're in to that sort of thing.
+1 on the helmet - wearing one has saved me more than once.