Be, do you have anxiety disorder? Any of many factors could kick this up, esp steroids, but since you are tapering, one would think the anx would be decreasing, not increasing. Were you anx before the taper?
Just a thought: I was told never to take generic Synthroid as it wasn't regulated as well as brand. That was a long time ago and may not hold true today.
I still take brand tho.
Hope you get better...anxiety is so tough.