That's a really interesting dream. The flames that you couldn't see but others could in particular. Of course the first thought people have about flames in a dream is to do with hell fire, but that's not the case here (or I don't think so.) I think it refers to the anguish you've suffered in the course of your illness.
The death, though traumatic, in your dream did not reflect on any action of your own. It seems to have been simply a consequence of your being alive... all that live must die. It seems like you came to terms with it, not as something to seek, but as something that will come in it's own good time. The fact that this didn't scare you seems very significant too. It seems like you renounced suicide at this point in your dream.
The drowning could symbolise some kind of rebirth or renewal... again the obvious idea is from the Judeao Christian tradition, the baptism. But I think its' more likely a case of you facing your deepest fears.
What's been going on recently for you to be so vulnerable in your dreams?