I was working with a group of women last week on the idea of creating a WANT to do list vs. reacting to a NEED to do list. This is an exercise that I enjoy doing with people, where we take a step back from our need to do, should do, have to do mindset, and reframe our thinking to developing a want to do, love to do, look forward to doing list.
You have to be willing to work on releasing the beliefs that aren't serving you, and making your best effort to avoid things that further cement your negative emotion. You have to be willing to spend some time doing whatever you can to bank some of that positive energy so it can gain more traction. It gets easier over time.