It was an Iyengar-style class, and the wonderful Indian-born teacher told us to just do it, "just like Nike." After backbending and forward bending at the wall to his commands, I felt aligned but a little congested.
Nonetheless, I just did it.
An hour later, I looked like this, tiny eye balls inside swollen lids. My face got all itchy. The same thing happened a month ago. Suggestions?