I know the feeling. for me it is as though ice has overtaken me and the possibility of a cathartic cry seems utterly impossible. Sometimes there is nothing I can do but I have found that there are a couple of triggers I can use involving specific movie scenes. There are 3 that work for me. The end of the series finale of Lost, the end of Titanic (cheesy I know) and the end of The Notebook. I am not a crier but sometimes we need that soul cleansing cry to clear the mind. Once you can have that cry try making a short list of things you want to accomplish in the short term. No more than a week. Don't set yourself up for failure by trying to take on too much. Try taking on one new thing to better yourself. even one step forward, however small, can lift your spirits to take another step.
I am am so sorry you are over stressed and dealing with a broken heart. I have been there but I promise it will get better. Time has a way of passing faster than we think.
((((hugs)))))