Hey farmer, I feel for you brother but as I am sure you know, you are not alone in that battle. I have about the same problems, have OCD as well as GAD as well as social anxiety disorder. As most everyone here can tell you, even online I disappear at times because of it. I have difficulty in crowds, especially stores, and have had a hard time getting out of my house at times it can be so overwhelming. I am just saying all of that to let you know, I understand exactly where you are coming from.
My friend Eek made a good point and one that I am currently researching more on. The high CBD strains do tend to relax me with the panic attacks, especially with when I have a little advance notice of one coming on. They are good for immediate relief of intense anxiety. The social anxiety aspect, not so much for. I would say that a true 1:1 CBD:THC or greater is as good as the benzodiazepines, which is what all the anti-anxiety medicines fall under. Xanax, klonopin, valium, they are all different variations of the same drugs. I keep some in my pocket no matter where I go because they will help the situation if it gets out of control. The big drawback to the benzos are their ability to build of tolerance very quick and the "bounce back" effect that they have after one quits taking them. They have a tendency to make the attacks worse the longer they are taken. I have used them on and off for about 20+ years. So the high CBD strains are good for their replacement.
The other thing to consider is, a lot of people have suggested indica dominant strains. In my experience, I use indica dom strains for night time right before I go to bed. They help me wind down and stops the mind from racing but they will cause a panic attack if I use them during the day. You said you have smoked for years so I am sure you have ran into those strains that just do that to you. The thing is, as I am sure you know, different strains are going to affect people differently. What may work for me may not necessarily work for you as well. So my go to choice for the past year at night is Night Queen. It is a 3-4 hit 100% indica that will knock me out within 15 minutes. Stops the mind from racing and really helps me sleep through the night which is important for anxiety as the less sleep you get the worse the condition gets and it is an endless cycle. Sleep cycle is the most important thing for me to try and stay on top of. If I do that then I cut my disorders in half.
The other strain that I predominantly use during the day is Strawberry Cough. It is a sativa dom strain but it really works for clearing my head and allowing me to focus throughout the day. I find that if I don't pay attention it is almost like I am not high when I smoke it, my mind gets very focused and I feel like the cloud has been lifted. I also like haze varieties, Mango, Super Silver or Lemon all work real well for me. Smoke too much and my heart will race but so long as I keep an eye on my dose they work perfectly to help with social anxiety and allow me to get out in crowds without much problems.
Best of luck brother and I am always around here if you need to talk. These types of disorders can be very defeating at times but always remember there are other people out there dealing with them too! You aren't alone and it is nothing to be ashamed of. I lived for years in the emergency rooms afraid to tell anyone what I was going through because I was worried what people would think of me. It made my life 100x more miserable hiding it, now I try to talk to anyone going through the same problems and help them.