Hypervigilance is rough. I've been to various types of talk therapy and what has helped the most is somatic therapies - therapy that deals more with the body and processing emotions as they occur physically. People who have been through traumatic events often stifle what they are feeling, to the extent that often it can be difficult to even put a name to the emotion you're experiencing. I remember early on my therapist would ask me, "And where are you feeling this [pain/anger/sadness] in the body?"

When you're out and feel this sort of hypervigilance, try and remember that question. It helps rebuild those connections and gets rid of a lot of that floaty, anxious sort of feeling that comes from being ill at ease.