Well, I hate to say it when it might make you worry more, but it is possible, that by taking the
Methadone so long and taking so many
Xanax at once, he has caused organ damage. Both of these pills are processed through his liver, and while the Methadone is gentler on your body organs than some of the other narcotics, it can still cause damage with long term use, and of course taking as many of any med, as he did of the Xanax, will almost surely cause organ damage and problems. It can damage your liver, kidneys, heart, lungs, stomach, intestines and etc.
You also do not have to be diabetic to get cellulitis, though it does occur more often in diabetics, it can happen to anyone.
It is also possible that he has developed blood clots, a condition like Lupus Anticoagulant would also cause these symptoms.
Then again, it could be related to his alcohol use, a combo of the drugs and alcohol abuse or NONE of these.
It is very hard to say what exactly is causing the Edema and breathing issues, and I am sure no one on here can give you a definitive answer.
I know you are worried, but the docs are doing the best they can to try to figure out what is wrong and in the meantime they are providing supportive therapy. Some of the tests that they need to do to determine what is wrong or to rule out some conditions can take several weeks to do in order to reach a definitive conclusion.
However, I wish you, your father and the rest of your family the best and I hope they can achieve some results soon to help him.
verwon@gmail.com
My information is not guaranteed correct. I do not get them right all the time, but I do enjoy the hunt~