I think it is good that you have started this thread and there is some wonderful advice on it, especially from jugendsteil but also many other posters. Suicide ideation is distressing and for me, I was lucky to get an excellent counsellor through my work but even then, I never mentioned it because I was scared it would trigger a lot of responses and concern. I cannot imagine that a therapist who said they did not like you is a good therapist. It should not even be a question they would answer or voice. I don’t have a supportive and close family (birth family, I mean) and I think that does make things harder, especially at this time of year when the emphasis is on family.
In terms of exercise, I wanted to pick up on what you said here - I joined a gym two years ago, mainly to lose weight but I also found it good for my mental health. There is a routine involved and you get to know people to talk to. I find it clears my head enormously. I also like swimming and use the sauna, where I like to meditate as well. I do find it gives me a boost over and above walking, which I also do as much as possible.
When I was really struggling about ten years ago, I found pleasure in the sky (sunrises and sunsets) and the colours of flowers - it was like I had been seeing the world in grayscale and now I could see colour, I will never forget that feeling of actually seeing, or probably more like noticing, colour.
I like the idea of doing something new every day, I am going to try that one.