I am undiagnosed and I should see a therapist. That said, I feel like I regularly experience high functioning anxiety as a constant part of daily life.
What this means to me is that I feel continual dread, fear, frustration, angst, and shame. I am sometimes happy and content, but it is rare. Sometimes happiness for me is a weird and manic experience. The absence of pain can overwhelm.
Still, I somehow manage to get things done and have a professional career. I think I have an extensive array of adaptive behaviors, workarounds, and have worked to draw boundaries around myself in a kind of psychological bad sector map.
When I am forced outside of my boundaries, I sometimes find myself becoming (or at least in fear of becoming) spastic and shrill.