Angioma and macular holes

I saw a second specialist today who said that I have PVT and that the tumour is sticking to the retina and so surgery would be extremely risky because even the slightest nick would result in a haemorrhage.
I only saw the specialist for a few minutes and after I recovered from hearing news I didn’t really want to hear I now have lots of questions and no one to ask so on the off chance you can help I’m asking this help group.

Q. If a macular hole remains untreated can you eventually loose all of your vision or does it only reach a certain level?
Q. Is it dangerous to leave a macular hole untreated?
Q. Is the only way to stop a haemorrhage to corterise the site?
Q. If there is a large haemorrhage in an eye is it visible from the outside?

update on this -
 Only reaches a certain level

nope - well I have to be aware of retinal detachment

Kind of but haemorrhages are not such a big deal, the blood is reabsorbed.

no, well not little ones