I can perform my job functions, but I can't get to work due to my disability. Can MetLife force me back to work?

I’m 48 yrs old and had total knee replacement surgery on Oct 20th. As a result of the nerve block, my femural nerve is now dead. I can’t lift my foot or move my leg at all. I can’t walk at all w/o a walker, and even at that, it’s a short distance as I drag my foot and leg behind me. I can’t go up and down steps, and I can’t sit for longer than 20 minutes at a time. My problem is this….I work 1 hour and 20 minutes from home, there’s no handicapped parking at my building, and I work on the 17th floor. I have a desk job, so I can perform my job functions, the problem is, I can’t get there. I need to stand every 20-25 minutes, which is impossibly w/ the long trip to and from work. There’s no way I can park at a parking garage 2 city blocks away and drag myself thru the city. And God forbid I get up to the 17th floor and there’s a fire. I can’t go down 17 flights of stairs down the fire escape. MetLife is ready to deny my claim and force me back to work. Where do I go from here?