This is just going to take some time, Jac. It's a shock.
The last breakup I had was difficult too. I remember wishing I could change things somehow, even though it was for the best that we broke up. Have you heard about the five stages of grief? Anger, Denial, Bargaining, Depression and Acceptance. What you are going through is very human and necessary.
Hug.
Keep doing things that bring you some happiness. Walks, hot showers, drinking tea, museum, the beach.