Dead
You were near dead and by God was he going to do everything in his will power to stop that process. To go against God's plans and write over it with his own.
He put your body in a chamber to stop the process of decay, of rotting flesh. Tubes helped your heart and lungs stay active even if your mind wasn't. He'd spent so many years creating new formulas, creating and experimenting on so many other people and creatures all for you. You hadn't aged, your body and mind was stuck in the time you passed while the world around you grew. Evolved.
He finally got it, after years of trial and error, he created the perfect solution to bring you back, to heal your body, to start your mind. He removed the tubes, opened the chamber, and took your body out. He dried it off and with a shaky breath of uncertainty plunged the needle into your skin and injected the liquid into your body
Your body had changed. It was much more durable, much more like a machine than human and yet to the touch your skin was of silk. You hadn't aged, your body and mind the same as it was those years ago. Memories had holes in them though, the liquid having made some of those joyous moments you had years ago fade, holes burning in them leaving them forgotten
...But, it was a price he was willing to pay.