I'm so sorry to hear about this sudden and very frightening turn in your husband's health.

Of course, it is hard to know what the doctors are thinking. When they give minimal information it can be because:
1. They really don't know.
2. They do not want to answer a lot of questions that require explaining complicated potential outcomes.

Sometimes it helps to ask them to summarize the potential paths that your husband's condition might take and what events/tests/metrics would indicate that he is on one or the other path. That way, instead of just waiting, you know what you are all looking for.

Wishing you and your husband the best.