I can imagine how scary that must be, Brandi I’ve had a recent experience with my partner that’s similar to yours. You have my support and empathy!
It sounds like your partner has been through a lot – and thank them for their service! – so I can’t imagine what his mind and body are going through. Since he’s been to the ER I can only assume that he’s working with medical professional to help figure things out. That’s perfect! So, here are a few spells that might be able to give a boost to healing.
Here’s a post about how to send healing energy to someone.
We did have a Weekly Witchy Challenge about healing magick. You might find it helpful to look through the entries there and see if you can find a spell to help you.
@SilverBear has written two wonderful spells to help someone else heal.
I know there are also several spells here on the forum that are specific to healing.
Here’s one that I wrote, for example.
Whatever spell you choose to use, I wish you and your partner the best of luck and all the healing!
I’ve had a recent experience with my partner that’s similar to yours. You have my support and empathy! 
So, here are a few spells that might be able to give a boost to healing.
and all the healing!