I've had this happen recently and told my therapist how upsetting it was. She disclosed that she's under a lot of pressure in a different area of her life, which made her impatient. It helped to know that something else was going on. Of course, it continued and I again thought it was me, and she explained that the situation is ongoing. I am hoping it's not permanent. I don't know the specifics, just the general situation.

If your therapist is acting different, it's worth clearing up.