I would try bagging the plant. Use a one gallon zip-lock and close it for a few days. If the plant starts to perk up, then open the bag slightly and leave the plant there for a week or two. Just be sure not to put the bag in direct sun! Indirect light will give the plant a chance to recover without burning it.

Dave

The plant perked up after a few days, I've also repotted it, a little deeper, because it's getting leggy, and it's got a bud. The leaves do have damage and I took off the worst leaves when I repotted it.