Hi OP, I'm sorry you're going through such a stressful time 
My brother was put into a coma after he'd contracted Leigonnaire's disease. It was 20 years ago now, and it's difficult to remember the time-scales involved because it's a nightmarish blur.
He went in with pneumonia, almost immediately knocked out and ventilated. I remember a young junior doctor standing in a corridor arguing with a consultant. The junior doctor was adamant it was Leigonnaire's and her intervention saved his ife.
The doctors kept telling us to say goodbye. The nursing staff in intensive care told us they'd 'got people back' who were this bad before and not to give up hope.
Later the doctors said they had no choice but to turn the life support off, as the carbon monoxide blood poisoning was kiling him.
When the life support was turned off he didn't die. He just kept going. The next day he sat up in bed, projectile vomited and asked for a sandwich! It was almost miraculous. The nurse sent me off with directions to the hospital kitchen because they don't have food on the intensive care ward (I got lost).
After waking up he suffered frightening hallucinations and shouted about monkeys coming out of the walls - I think it was a side effect of coming off all the medications, he'd been pumped full of every antibiotic and antiviral going, which made him puff up and go slightly orange (so there was a hint of Elvis about him).
His kidneys didn't swing back into action straight away, he had limited vision in one eye and problems with balance. Within a few days he was back at home - the care on the intensive care ward was amazing but he ended up on a neglected renal ward surrounded by dying elderly men. When he phoned my parents hysterical that he'd been put there to die and they wouldn't even give him a pillow, my parents fetched him - signed him out and carried him to the car because staff couldn't find a wheelchair.
He was very weak, but he needed to be at home, he'd been through a terrifying experience. GP came to see him every day - mostly out of guilt we think, because he'd misdiagnosed Leigonnaire's as a panic attack and if we'd taken his advice my brother would be dead.
He was off work for 6 weeks I think. The kidney and vision problems rectified themselves quickly. It was lucky that he was young (mid-20s) , fairly fit and had never smoked - or things would have been different. I don't remember him needing any physio, he did need lots of rest and support doing simple things around the house because he was so weak.
The only ongoing issue was with balance, he was okay on the flat but got dizzy on slopes or stairs. He used a fancy walking cane for years, and quite enjoyed the attention I think! The whole experience has left him with hypochondriac type tendencies, but it's a small price to pay and understandable.
Hang on in there OP, just take it one day at a time and you'll get through. Don't forget to eat and sleep. 
