Sup... I have gone through the ringer all the way--got to a point where it was either quit or face the storm, so I did, I kept getting high even though it was exacerbating my anxiety, but I chose to work with it. As a result I am now able to enjoy weed at pretty much any tolerance level--even when I have no tolerance and I'm practically tripping, I can work with it so much better now that I've chosen to face down the 'threat' rather than run from it.
The most encouraging thing I can point out is that life is all the same, in a way... all altered states are relatively similar to our normal state--anxiety attacks can happen when you're sober, just like you can have a good time when intoxicated on something that you think causes anxiety if you happen to catch yourself off guard with a positive experience to reinforce it.
Anyway--what I wanted to say is, some strains are definitely more exacerbating than others, but I don't think you have to stick to indicas. I find indicas sort of depressing... if you enjoy being stimulated but don't want anxiety it can be pretty hard to hit that middle spot... but there are definitely some sativa-dominant strains that will meet your needs... and there are others that will totally kick your ass if you're anxiety-prone... haha.
I switched to indicas to deal with anxiety but started getting bit from the other end by a lack of motivation and a depressed feeling. One of the main reasons I started smoking was because I like the stimulation. While it is that stimulation that eventually evoked an anxiety response, to take it away leaves me with very little reason to bother with smoking. I like being stoned occasionally, but I really prefer to stay as active as possible otherwise, simply because my body and mind always feel better after a day of activity or work rather than a day of sitting around. Granted, you do not have to sit around when stoned, but just saying, for me, it took away one of the main things that I was enjoying about weed to make that switch, so now I am seeking out anxiety-friendly sativas. (Although I've learned to work with anxiety well enough that most strains don't bother me, occasionally I get caught off-guard when my tolerance is low. Although I'm much more comfortable with anxiety than I was years ago, it is still wiser to avoid exacerbating the issue with particularly paranoia-inducing properties, imo)