Hm, if this only began 2 years ago I do wonder how this started. Any significant live events or physical injuries that occurred during that time? Or perhaps it's a development?

Sorry your therapist wasn't able to help. I hope that he's only been unhelpful regarding these issues? Perhaps it's not something he's particularly knowledgeable on. Unless most of the therapy has been about these issues?

As for the issue itself, well, the possible explanation that consistently came up in searches is adhd. If you haven't checked already, perhaps the symptoms align with some of what you're going through. But honestly, this is something I would have thought a therapist would have already been able to identify as a possibility. Maybe next therapy session you can emphasize the issue?

Adult attention-deficit/hyperactivity disorder (ADHD) - Symptoms and causes - Mayo Clinic