I saved my wife and daughter, but the "what if" still haunts me

My wife, daughter (15 month old), and i were doing a small 0.5 mile hike through the woods to a small water fall, after arriving I wandered around looking when I heard a scream, rushing back I see my wife who can’t swim in water at least 8 feet deep, unable to see my daughter, my wife yells “I can’t find her” I see my daughter under the water maybe a foot behind my wife, I dive in and realize I can’t touch either. I grab my daughter holding her above my head as l hold my breath and attempt to swim back, I get her back onto land and go back for my wife, immediately going to the ER, fortunately nobody was even slightly injured, my 1 year old daughter has absolutely nothing wrong, how im not sure. But after leaving the ER, we had a 3 hour drive home and by now I was starting to calm down and beginning to think very dark thoughts like “What if I hadn’t seen my daughter” “what if I was to late” these terrible thoughts and images have been flooding my mind for 24 hours now and I just want it to stop I know my family is ok, but damn this shit is fucking me up, almost loosing my girls at the same time. Any advice is welcomed.