AITA for asking my husband to vacate our mezzanine flat while I do my therapy sessions

I have been doing therapy for about 6 months now, largely encouraged by my husband.

Although he makes a big deal about having to leave the place we live when I do the sessions.

He works freelance so his working days change, sometimes he is off on the day I have therapy, sometimes he is working, but if he has the day off all he'll breaks lose about me needing the space to myself.

In our last place, I had morning sessions, he said it was unfair that he had to leave and could stay with noise cancelling headphones. So I tried afternoon sessions also didn't work.

We have just moved into an open plan studio / mezzanine style flat and I have an evening appointment at 6pm this evening.

When I told him this last night he said that it was a horrendous time for me to do it as he maybe finishing work early tomorrow, he will be coming home regardless and I should be in the upstairs part of our open plan flat and he won't come up.

I honestly think he's being incredibly selfish, I have to talk about unthinkable heavy stuff and he knows that!

But ultimately he says we have a studio flat I need to learn to deal with it.

Should I just be dealing with it? Am I the asshole for insisting that I need the space to myself?

EDIT:

I do them online because we have very low income and I have found affordable sessions online with a charity.

The session is 50 minutes once a week.