I have to bebhonest, the advice ti let it go and just work yourself, while being the one I can implement in the long turm, seems like giving up.
Why does it feel like you are giving up? What can you do better?
You said you never gave her money. Do you mean before the breakup that you never gave her money for anything, or were you referring to after the breakup?
Currently, you are in panic mode. It wear you completely out and make you ill. These problems take time to work out. It usually takes much longer than you dreamed. Try to calm yourself.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!