I lean heavy into the anti-inflammatory side of tackling this thing. I found it surprising what simulating the vagus nerve can do in that regard. 
I do the inner ear, with a light rotational movement. Never want to push too hard. Then pulling on the ear in any direction firmly, indirectly sends signals to the vagus. Even soft touches of the lobes produce a nice feeling.
Phenibut is used a lot for anxiety, but can have withdraws and build tolerance very quickly. I would recommend (in a non-medical speaking opinion) taking a benzo, just once, and see if you feel better. Assuming you do, and you have a GABA “dysfunction” - like most of us do. Then phenibut would be a nice alternative.
It took awhile to dial my dose in, but I can take it once on a Monday, and feel it all the way into the weekend. On top of red light therapy, breathing techniques, and lately the vagus stuff. I have almost 99% control over my heart rate and anxiety. Hoping if I do this long enough, I might be able to permanently stop the stupid anxiety.