Need Advice Tree in need of a band-aid

I have a hibiscus tree that I keep on our porch during the spring and summer. I've had it for two years now and it seemed to be doing great. Towards the middle of summer it started to lean a bit, my guess because it was getting too top heavy. I purchased a tomato stake and got some garden type twist ties to help it stay up. That helped a little, but not enough. I brought it in a few weeks ago from the cold (like I did last year) and came down one morning to find it completly on the ground. The only thing seperating it from total death were a few roots.

I had all but written in off when after a couple days I noticed the leaves were still green and the branches were still strong. My questions to you, all-mighty garden gurus are?

1. This tree can be saved right?
2. Can I go get a garden/tree tape of some kind so it can mend back together?
3. It obviously lives in a pot so should I trim some off the top so it's not so top heavy and it won't lean or just get a much bigger pot so it has a better base?

I do have another tree that I brought in for the winter as well. Is there anything special I need to do now that they are indoors? My other tree is looking a little droopy. Obviously water them less and keep them near the sun. Any special food?

Thank you oh wise ones!