I'm so sorry you and others are going through this, @Dontknowwhattodo223 . From what you've written, it sounds like you're experiencing a serious depression. Before making any irreversible decisions like Dignitas, it could be worth giving mental healthcare another shot and seeing if they have anything to offer that can help. If you're under the care of secondary care services or higher already, then you could tell them how low you feel and that you would like an urgent case review, including medication review and consideration of other interventions. If you don't have secondary care input, you could consider private psychiatry and/or psychology - it's a potential investment in your life and health, which is worth the outlay.
There are lots of medications and non-pharmacological interventions out there, and it can sometimes be a bit 'trial and error' to find one that's a good fit for you. If you aren't keen on medications, you could ask about TMS, ECT, etc too.
Therapists and counsellors aren't always psychologists or psychiatrists. It sounds like there's a lot that you might want help to explore, so I think it would be important to have a therapist with a high level of expertise, who can recognise when and how to apply different models of therapy to give you the best chance of making progress. If you feel that your current therapist isn't helping you, tell them and your healthcare service, so that they can try to improve things for you.
From what you've written, it sounds like you're a very caring person, so you might get some sense of personal satisfaction and healing from activities that help others or the world around you. If you feel that's something that might be beneficial, you could try getting involved in a community or nature-focused project/group (your mental health team or GP, or local mental health charities might have details about ones in your area), or even just start with something like feeding birds, to see that your actions (even small ones) can have beneficial consequences for the world around you - that you, alive and even as you are now, can be a positive force in the world.