Rainbow, I wish I knew some words at would soothe you, i wish I could tell you this will be easy or some magic tablet we could swallow that could make us forget about our ts but unfortunately there isn't.
Your t said in six months the price could chnge for a session, she might be able to lower it. Maybe you will not have to quit and everything will work out, maybe things in real life with you and your husband will improve and you might not feel the need to see t anymore. i just hope that you will be kind to yourself and that you decide what you need and not your husband.
I do think that keeping busy with your art and doing some mindfulness will be good for you right now