I'm so sorry for your loss,
but I am left in deep respect at how you handled the situation.
If I am ever in danger, I can only hope to have someone respond so quickly and professionally as you did. The way you responded to the signs of distress, jumped in personally when it was clear it was necessary, even tearing your rotator cuffs to make the rescue possible, then managing CPR, coordinating the scene, communicating for help, and reacting to equipment issues like the ladder, shows an unbelievable and heroic response.
I can't tell you not to feel bad, I have never been put in that type of situation, but I hope you are able to feel at peace with your response soon.
I would be honored to dive with you, and hope you are able to get back in the water soon.