I think a lot of good advice has been given to you. I just would like to summarize it. You're no longer a JW, and therefore are not bound by their rules anymore. They pushed you out. Find someone who will consider preserving your life and wellbeing as the primary goal, and give that person authority to decide for you "just in case". Go to where people will do whatever it takes to save your life. Yes, ask the hospital to restrict visitors to those you can trust to save your life. Once you're out of the surgery, go recover where you will find unquestioning support for your decision to save your life, not to where they will criticize you for staying alive.
It is only natural to try to stay in touch with your parents now that you're undergoing surgery. They should provide you with all of their support. That's probably what they think they are doing; I don't think they have come to the point where they dont' care about you. The fact that your mother was crying over the elder's refusal to have anything to do with you is proof of this. They aren't helping you the way you would expect them to, or the way they should if they had a non-JW perspective, but don't let that get to you.
You have plenty of friends in this board. If it's not burdensome to you, once you're out of the surgery, keep us posted about your recovery. This kind of moral support is all we can do from the distance, but we'll do it for you.
I don't pray, but I have you in my mind, even though I have never seen your face.