How gutting, from personal experience, loosing 2 within a week, was hell, so I can only go part way to understanding how you must be feeling at the moment.
It is always hard to make the decision to PTS a ferret, but having just lost one earlier in the week, it must have been very tempting, to try to ignore having to make it. Well done for managing to still put the fuzzy's needs, over your own at such a difficult time.
Sweet Dreams Alfie and Stan, have lots of Fun at the Bridge, and don't forget to look up Snoopy.