<human>: Give me the gist of the text in a nutshell

Yesterday my live-in boyfriend was hospitalized, let out of the hospital this morning, then re-admitted this afternoon after calling 911 and being unable to breathe. The paramedics said that he saved his own life today by knowing when to call (which lots of people don't do), for which I'm so proud and thankful, but I'm also really terrified. If he hadn't have received the shot of adrenaline that they gave him, they said he would most likely be dead.

The nurse at the hospital said that it will get worse from here if this happens again. She mentioned things like dust and mold, which are a no-brainer to keep away, but it's frustrating to not know what else I can do. I don't know how it can get much worse than this, and could really use some tips on what I can do to make this less likely. What can I do to assure the safety of my boyfriend without having to throw him in a plastic bubble? He will be home from the hospital in a couple of days and I'd really like to make sure everything is safe and in order for when he gets back.
<bot>: My boyfriend had a really awful asthma attack today and almost died. I need to know how to keep this from happening again. Any advice/product recommendations are very, very appreciated!