I'm so sorry you're going through this. Dealing with the limitations of short-term therapy is tough, and it's so difficult that the people who need help the most are the ones least served by the 10-20 sessions model. I probably had about a hundred sessions with my current T before I was able to see the start of lasting changes. When you have big problems or a difficult past, it can take a lot of time.

I do think it's highly possible that your T cares about you and wants you to feel better. My T worked at a place that was increasingly pushing a short-term model, and eventually she quit because of it. She wanted to work with people for as long as they need to because she cares about helping people get better. Lots of people become therapists because they really do care about people and want to help. But still, I'm sorry that you're dealing with these limitations. I know it's hard to open up to somebody when you know that you won't see them for very long.

Is there any way for you to access longer term therapy? Or to devise a plan so that eventually you can access it? I am not familiar with the UK system, but maybe somebody here can help.