I would highly suggest seeing a doctor. I can totally relate - as I had GAD (have had it for about 7 years) but I also self medicated with benzo's and alcohol. First of all, know that it's a toxis mixture and you can easily overdose on it. Also, dating someone who is equally unstable/alcoholic as you are is probably not the wisest decision, but it's all up to you. Definitely visit a doctor and be totally honest. The benzos and alcohol will worsen, I repreat, will worsen the GAD - trust me. The sooner you get off them, the better!
Message me if you need someone to talk/vent to. I'm not judgemental and I can definitely sympathize with you, but I can also offer you some basic advice. Take care and be careful!
Rachel