Hi Tom,
Sorry you are going through so many issues. It is difficult to deal with chronic health problems. While you mentioned a number of health conditions - the one that spurred me to write was the Adrenal Crisis.
Adrenal crisis/insufficiency can be extremely serious. Were you put on Prednisone (steroids) for the adrenal crisis? The opposite of Adrenal Crisis is Cushing's syndrome. While that can be due to a pituitary tumor, it can also be iatrogenic (caused by steroids). I am a steroid dependent asthmatic who fluctuates between iatrogenic Cushing's and Adrenal insufficiency each time I go down on prednisone. It is a constant balancing act with physical symptoms.
While reading, I did see sleep apnea mentioned. Do you have any respiratory problems (asthma or COPD), which are contributing to the apnea? If you were put on hydrocortisone or prednisone, that would also account for the weight gain, as well as lymphedema. If you have thin arms/legs, with severe swelling/fluid in the abdomen, paracentesis may be a good suggestion which you had. Have you developed diabetes type 2 with all of this going on - which could also increase your weight? It would also be another cause of the weight gain - as insulin injections increase weight as well. Have you been checked for lyme disease - which could also lead to fibromyalgia? Take a good look at your medications - are they interacting with each other - causing more symptoms. Vitamin supplements may be considered - but check your levels before you take anything.
I hope some of this is helpful. Good luck and feel better.