You're asking a bunch of lawyers whether you should hire a lawyer for a court proceeding. The answer is "yes." However, it is in our interest to say "yes." So I'll put it to you this way: suppose you had a toothache. Now, you could do some self help, grab a pair of pliers, and rip that bad boy right out of your head. Or, you could pay the money and go to a dentist. See the difference. But it's your call.
Yoga? What kind of doctor is that? You need a neurological consultation, orthopedic consultation, and MRI's at this point to make a clinical or differential diagnoses of your condition and come up with a proper treatment modality.
You can, and should, refuse all testing, Refuse to answer any questions. Any questions at all about your past whereabouts, about whether you have been drinking and how much, about where you are going - ANYTHING. When asked if you know why the cop pulled you over, answer "no," because you don't. When being questioned, your only answer(s) should be "I don't answer questions...I don't do tests...officer am I being detained or am I free to...officer, I am not going to answer questions without...
I would not hire a lawyer to work in my firm who had an AI at age 19 and now a second AI or DWI. If I were you there is a distinct possibility that you will have to find another field of work. But before that, you have a drinking problem that you must address.