ICU, man, that's sucks. I'm a bit of a "frequent flier" myself, but never in ICU that I can recall...although there was that incident with the ER and the backboard, and the ladder, and ouch that hurt like heck!
I've held the RWS48, as well as the Goldfinger, and owned a BAM30 which is modeled after the 48. The 48 and B30 are heavy guns, alot of power, but heavy to match. If you have arms like Popeye and want alot of power then you might like them, but if you want something you can shoot more than a few dozen pellets through before you're tired, then I'd go with the Goldfinger...ya know they also have a .20, which sounds like the ticket if you hunt too. I myself went through that "Magnumitis" when I bought my second gun, it's hard to shake it. I've found now that I really enjoy shooting my CO2 guns when the weather is right and most of those are shooting mid 600fps in .22 range(exception being the Mike Melick AR2078, that thing has muscles!). Actually I can have a heck of alot of fun shooting my kids Red Ryders, fill it with BB's, cock, shoot, cock, shoot, so easy and light it's relaxing. Maybe see if someone will lend you their big heavy gun for a month or so to see if you really want one, it might just cure ya.
Good luck, I know it wont be easy,
Dan