May I suggest, this is nothing to do with a revert. When anyone is having a medical emergency, the medical emergency comes first, and hijab comes second. If he is jealous of ER personnel who are treating you, he is the one having a problem.
Situations where women died due to prioritizing hijab over life - for instance, when girls fleeing a burning school in Saudi were sent back inside to get their hijabs, and burned to death - are not noble; they are sad.
It could be worthwhile considering Islam and the marriage, as separate issues. Being a Muslim is not the same thing as being married to this person. It could be worthwhile to consider how the marriage is going, and whether it is a healthy marriage and offering what you need (especially since you are not living together). Even if you are a revert, the job of a husband is not to be the religious police; it sounds like he may want a situation where he can be in control, but this may become tiring over the years. On your side, there are many resources about Islam available online these days, and it would be good to focus more on learning on your own, rather than being dependent on him to teach you, which can set up an unhealthy psychological dynamic. Conversely, it could also be worth considering whether or not you would remain a Muslim if the marriage broke up.
This will depend on what type of divorce was conducted. If it is raj'i (revocable), and within her 'iddah period, then they are husband and wife again.
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