Please Pray for my Dad.

His heart is in Afib. Im not sure if i spelt that right but it means that it isnt beating properly. Both the left and right arorta are just viberating. They are meant to have a steady pump but they arent. He is going to the hospital soon for an operation where they have to stop his heart and restart it. Imreally scared. To help his blood control he has to take cumidin. This medicine helps but also is very dangerous. If he even bumps or slightly scrapes himself he wont stop bleeding. He just keeps bleeding lik gushing blood or he bruises. Today he got a bug bite. And he hasnt stopped bleeding. He got the bite at 8 oclock this morning. It 4:39 pm now. He once just sat down on his elbow and it sweld up. It was huge and a purple gray. It really hurt him to move it. If he bumps his head he will die. Im really worried i love him too much

Please. I'm not asking for much. Just a prayer.