Proof God hears

Have you ever had someone say they cried out to God for proof that he existed or that he was really listening to their cries, or had that happen yourself and that there was an immediate response? Like a phone call from someone saying "I don't know why but I'm praying for you".

This is something I've only heard about from friends and never experienced myself, and I'm struggling with whether or not I should even need this. Lately I've been crying out to God about needing some very specific concrete proof that he is even hearing my hearts cry yet I feel such a blank wall, and then I start to wonder what am I doing wrong that I can't hear God.

I'm having to walk through such an ambiguous physical situation right now that if feels like only something concrete from God will ground me. And yet do I have the right to ask for that? I can't begin to find direction on this in my bible and I know that is my own fault for not knowing it like I should.

Lord God, you know what I'm asking for (and it's not a pregnancy, though that would be nice) and it's something I know only you could bring about. Please hear my cry and meet me today, show me you are really listening to my heart.