I'd lost so much weight pre diagnosis (classic T1 here) it might have helped me keep my underwear let alone my outerwear in situ when I came out of hosp.
Coincidentally my husband is in hospital at the moment because he's apparently got COPD and has suffered what the medics call 'exacerbation' due to a repeated really bad chest infection that 3 separate weeks of steroids and ABs failed to sort out so by Tuesday morning unable to breathe in enough oxygen to walk more than a few steps before he was ready to drop - 999 was called and they gave him oxygen immediately, did BP an ECG and a BG test and hauled him off to A&E pdq and trundled straight into 'Major' without passing Go, etc. Millions of tests and all sorts of questions that neither of us were expecting, the ones we were eg smoking, any previous lung damage seemed to be less significant than these odd ones - a major one of which was whether he'd noticed any swelling in his hands or feet. In fact that very morning he'd struggled to get his shoes on in order to depart in the big white taxi with the flashing blue light parked outside our house on the double yellow lines. And his hands and feet had both been freezing cold despite him being inside all day with the heating and warm clothes on.
Turns out in his case - it's a classic symptom of nowhere near enough properly oxygenated blood reaching the extremities and flowing round them which if it goes on long enough, itself causes fluid to build up there. I never knew that before neither did he.
Applying it to your situation and thinking of what happened to me pre-diagnosis (and very luckily I was whisked into hospital PDQ before I actually went into full blown DKA) all my internal organs were suffering apparently including my heart - I had been experiencing heart palpitations on top of the other symptoms of T1 which is why I really thought I'd better go to the GP in the finish. Now then - if the heart is struggling to pump the blood round the body
because it's full of acid and poisonous anyway - couldn't much the same thing have been happening to you as has happened to my OH?
Just calling up
@mikeyB - cos he has one helluva lot more actual medical knowledge than most of us lot - so when he has ad time to take a read of the thread he might be able to give you some proper/better info. He usually can! LOL
It would be nice for us both to have some idea when the oedema might dissipate - but you take priority here!