I would agree that, like you, anxiety is my worst symptom too and yes I am exhausted by mine yet can't sleep at all! It's now 1.33am and having gone to bed at 10.20pm, absolutely shattered, I have managed 1 hour's sleep before waking up. My head was feeling so weird, I have had to get up to try and distract myself.
Like Samade, I was feeling really good and had peace in my head, then since taking Topiramate for migraine, a whole host of anxiety problems have reappeared. I stopped it nearly 3 weeks ago and the anxiety/low mood had been slowly reducing again, to the point that Mon-Thurs I was my old self again, then out of nowhere on Thurs eve, whilst cooking dinner, I started to feel odd again. Friday was a pretty horrible day with me pretending to be ok at work, then crying the moment I got home.
Sad times.