well something is clearly bothering you. Are you sure it's about the house and the paint etc...

Do you find that, in general, your therapist minimizes how you feel about things?

Do you think she is just not "getting" how bad you feel in general?

What is behind the compulsion to paint do you think? Do you want to stop?

I gotta say, most people do celebrate artistic expresion and a creative mind often gets so involved that other things, like room to move in the house, take a back seat.

What matters is how you feel about it and how it affects you.

Seriously though, you might want to consider organizing a show or something. You could make some money.

There is nothing that kills a hobby quicker than "having" to do it. Then it becomes work.