Thank you for the responses.
You have a potential lawsuit here that could involve several claims that range from false imprisonment, false arrest, assault and battery, intentional infliction of emotional distress, and a violation of your civil rights. These lawsuits could pose liability upon the officer personally and if you can show sufficient fault on the department you may even be able to pierce governmental immunity and sue the city.
Before you get to the hyper technical legal details of a lawsuit, you need to take the video to a local civil attorney and let them review it. Preferably you want a lawyer with experience in civil rights litigation and/or false arrest and malicious prosecution. These are complicated matters when attempted against the government and experience helps. If the attorney feels your case is worth pursuing then you will probably be able to work out a contingent fee agreement where the attorney fee will come out of the recovery... if any.
So I can tell you there is a potential case here based on what you've said. However, I have not seen the tape and cannot give you a good basis for my opinion except that it is entirely based on your assessment of the video and the officer's conduct. If an independent review of the video shows you acting in an agitated state on the roadside to the point of endangering the safety of the officers who are attempting to investigate a suspected DUI, then your temporary detention would likely be valid and even with a rude officer you would not likely have a good lawsuit. Further, if your conduct rose to the level of Disorderly Conduct then you could have been arrested and their decision to release you would simply be good fortune... not grounds for a lawsuit. Here is the law in Tennessee on Disorderly Conduct...
39-17-305. Disorderly conduct.
(a) A person commits an offense who, in a public place and with intent to cause public annoyance or alarm:
(1) Engages in fighting or in violent or threatening behavior;
(2) Refuses to obey an official order to disperse issued to maintain public safety in dangerous proximity to a fire, hazard or other emergency; or
(3) Creates a hazardous or physically offensive condition by any act that serves no legitimate purpose.
(b) A person also violates this section who makes unreasonable noise that prevents others from carrying on lawful activities.
(c) A violation of this section is a Class C misdemeanor.
So basically you need to take this video and let a couple plaintiff's attorneys look at it. They should immediately give you an assessment of the situation and provide an independent and neutral view of your odds of recovery. Finding a good lawyer is best done by referral (friends, family, neighbors, coworkers, etc) but if that is not available try www.lawyers.com where you can search by practice area and geographical location. There are even peer review ratings to help you find a lawyer who is well respected in his/her area.
Please reply if I can help further.