Should I go into an outpatient alcohol rehab program?

I drink two big glasses of wine a night, and sometimes more. When I go out, which is rare, I drink about four margarita's in about three to four hours. I don't feel drunk from it. But, a year ago, I drove drunk a few times. I am very stressed out at work, but I come into work each day. I'm a functioning alcoholic, I guess. I make a lot of mistakes at work and in my personal life, but so does my non alcoholic coworker. This line of work is open for error due to the extremely heavy workload, and management doesn't accept it. I've always felt I will be fired one of these days. So, if I go into rehab, it will protect my job for three months & I'll get full pay probably. But, once I get back, I'm sure they'll catch all of my mistakes and fire me. I would finally have a chance to look for a job, though, as this alcohol rehab program is only about six hours a day, five days a week. With my stressful job, I have no strength to look for another job. Should I go into an outpatient rehab program or just try AA? I've been to two AA meetings and I haven't found it enough for me. No, I can't stop drinking, and I'm bipolar, too. Thanks.