Thanks guys.
I made it through the day. I wasn't overly productive, but I made it through.
I think it was triggered by the fact I was going into Central London last night. And I haven't been in for a while (and last time I went in I was with my T), so I ended up convincing myself there was going to be another attack. And then I got angry at myself because I was so anxious. And then I got anxious about the fact I couldn't get to sleep, and that obviously made sleep even more elusive.
But I managed the day on little-to-no sleep, made it into Central London (there wasn't an attack!), and although I was still on edge, I managed to get significantly more sleep last night than the night before.
I just need to stop winding myself up and convincing myself there's going to be another attack.
The anxious side of my brain is convinced that I "had a feeling" the last attack was going to happen... Which the rational side of my brain knows is nonsense. I know that I didn't "predict" it. Or didn't have a "sixth sense" about it. But I keep thinking, "What if I did? ... I'm having a bad feeling now... What if I'm right?" etc etc etc.
Does that make sense?
Sorry - I hope I'm not babbling too much.