I have great news today! He is a little more active, has eaten some pellets, and 6 mls of critical care mostly on his own! I’m so proud of him
Great news.

Keep hanging in there and persist with little but regular feeds and try to get as close as you can to 40 ml in order to get his weight up. It is great that he has not lost his appetite completely.
Make sure that you continue to look after yourself as well so you can be there for Ed for as long as it takes. You haven't got any control about the ultimate outcome but you can do your best in a way that you can keep it up for as long as you need to - that is all we can do in a comparable situation.