I cannot claim to have the same experience as you describe - that of pressure in your head. Anxiety certainly has caused me many physical symptoms which would include headaches, eye fatigue, and loads of others. I think a lot of tension and pain would come from holding my body in such ways that are more defensive and less healthy, and headaches that just come naturally when one is always stressed and never feeling at ease. But specifically what you say is not something I can say immediately that I have felt in reference to a certain session of the therapy.
My thought here is that you might consider this tension in your head as you would another symptom. Previously you had eye contact issues. You may have been too overly focused or concerned about this one thing. That happens to a lot of us when we over-think and get worried about something. And now, you are focusing in and, in a way, magnifying the concern over this tension in your head. It's yet another "thing" that we might grab onto and create more worry over. Don't. And I mean that - try not to over-think or dwell here. Keep moving and use a distraction. Don't resist this, but don't let yourself stay in this "yet another ant" place of over-focusing. What good will it do you? Not much.
I am interested if any others have thoughts on this post.