Too Many Weird Things

I do not understand what is happening with Sis this admission, and I don't even know where to start, in telling you guys everything that is and has been going on. As far as her respiratory infection, that is darn near gone, thank God! She is only requiring 1L of oxygen, that's nothing! :) HOWEVER- her electrolytes, blood pressure, cardiac function, GI system.... It's just been so crazy, and I welcome any anecdotal stories or suggestions. As far as her bloodwork, her potassium & magnesium keep dropping. They will give her supplementation and it pops them up, but they drop again. She continues to have A-fib arrythmia randomly throughout the day. She keeps having moments in the day where her blood pressure is dangerously low- with a MAP of 56-58, and her heartrate wants to hang in the 40s, but will literally bounce up to 70, and back to 40 with no movement from her. Currently, her oxygen saturation looks beautiful on the monitor, but her face and lips are very pale, cold, and she is "OUT" if you will. They gave her a bag of albumin, but it did not raise her BP, the nurse did a sternal rub to see if she would respond to pain, and she did. Her blood sugar was normal.I am at a loss right now with why all of these weird things keep happening, and how do we get her back to her stable baseline if the pneumonia is basically gone?