Sick Hibiscus

I brought my tropical Hibiscus inside before the cold started, but it is not happy. It's been inside almost 3 weeks now. The leaves aren't as shiny as they were when it was outside, and now I noticed that some of the leaves are getting dark, almost blackish patches on them. I really love this one and don't want to lose it. Any ideas??
Deb

Did you spray for bugs before you brought it in?
Loosing leaves is common when bringing them in, sometimes a lot of leaves.
Just don't overwater, give it as much sun / light as you can.
When the days get shorter they slow down, no fertilizer until March or later.
Andy P

Yes, I did spray it, but now I see my Blue Sky Vine is getting the blackish spots on it's leaves, too. Is that some kind of bug or disease, or ????
Thanks,
Deb

Don't know. Can you take a pic? That would really help.