Over the weekend I was a passenger in a cab in DC. We were severely rear ended by a hit and run driver. Any advice?

First, you should contact a personal injury attorney in your area. I am not an attorney in DC. Generally, insurance policies (especially commercial ones) have uninsured motorist coverage. Unless you (or the insurance company) can find the hit and run driver, an uninsured motorist policy would compensate you for your injuries. If you have an auto policy, you should consult your agent. You should also contact the cab company and file a claim under their uninsured motorist policy.