Hi hell's gate
Thank-you for posting and seeking advice and I am so glad you have conquered cancer.
I am really sad to see that you believe you have not achieved anything in you life. Achievements are far greater than financial and work related, even though at times our world does not feel that way. Fighting an illness like cancer and getting the all clear is a huge accomplishment, that takes a lot of strength.
When going through my own anxiety I also feel these deep black and white emotions. My first suggestion would be to write down 2 things you have accomplished today. These can be anything, such as eating breakfast, getting out of bed, having a shower, brushing your teeth, writing the shopping list, going for a walk, etc.
Beginning by looking at little achievements everyday you can expand this to 5 things today, or 5 things this week and so on until those feelings ease. I find writing them down on a post-it note each or in a journal allows me to reflect back on these at my highest times of anxiety.
In terms of your relationship, I hear you say that your partner wants to move passed everything but it is time to think about your needs.
The family relationship advice line 800050321 might be the best place to call and speak about your concerns with. They are closed on Sundays but open: Monday to Friday 8am to 8pm and Saturday 10am to 4pm
Please continue to post here if needed and I hope even just voicing your concerns has helped relieve some of your anxiety.