Sorry this happened to you, and glad you are doing better.
Just remember that it is bureaucracy, not malice that is making things so painful.
As ConcealedXDm implied, I know of no law that you can't CCW in a hospital in WA state. If I'm wrong about that, I'd like to know. :-)
You shouldn't beat yourself up about the details between when you were hit and getting to the hospital. The reality you were going to get separated from your bag in the hospital and so you had to secure it somehow. The officer is as good of a person to help you with this than anyone.
Remember, unless they had actual police officers at the hospital security, they are just some random guys. Personally, I'd rather have the officer secure the firearm as he hopefully understands basic firearms safety.
Also, keep in mind you had no way of knowing your friend's experience was going to be so smooth. It easily could have not.
When you are sitting in the ambulance it is difficult to know exactly what is going to happen when you get to the hospital and in the end, your firearm was secured, you have the officer's business card and most importantly, you walked away (so to speak).
While I'm sure it isn't any comfort right now, esp. with financial limitations, but Bark'n is right. You need a spare. Consider how less stressed you'd be right now if you went home and simply strapped on the spare. And, more importantly as he pointed out, if you ever need to use it to defend yourself, you will lose it to evidence for some long time if not forever. This will not be the time to not have a firearm if the perpetrator has buddies looking for you.
And I'm sorry nobody stopped. It is a sad commentary on our society, but keep the faith that not everyone is callous and disconnected.