Magnesium is worth checking out as well, even if you're eating a proper diet (nutrient bioavailability can be affected by a lot of things).
There's been quite a bit of research and interest in the role of magnesium in anxiety, depression and several other common medical conditions.
I take it along with a benzodiazepine and the difference now after supplementing mag. is very noticeable (sleep quality, functionality, anxiety) compared to the benzo alone, though in my specific case some level of mag. deficiency is quite possible, which could explain the change.
Make sure to get a form of magnesium that is actually bioavailable though. The oxide is apparently near useless as a supplement despite being very common, while chelated forms like magnesium glycinate are supposed to be much more bioavailable, and that form in particular doesn't seem to cause digestive problems like some other forms do (the citrate is actually marketed as a laxative if I'm not mistaken).
There are less addictive anxiolytics out there that won't kill you upon cessation. Opinion is shifting towards doling a few of them out to stop severe panic attacks and using other methods for treating anxiety.
Go to a psychiatrist and they'll tell you the best things for anxiety and mental health are: Exercise + a proper diet + sleep habits, reasonable to no alcohol/drug use, meditation, therapy and medication as last resort.
Try those first five things before popping pills, there are steps you can follow to make that feeling manageable and eventually extinguish the anxiety loop.
There is effective medication. Benzodiazepines get sometimes bad press but I've found them very useful to occasionally deal with anxiety.