Dying Plant? Please Help!?

I have an Avocado Plant that I got from outside growing in my compost. I took some soil outside and put the plant in a pot because it was too cold out side. About 3 months later there was little centipede like bugs in the soil crawling every where! So I put the plant in the basement for about a month. When we got potting soil. We then took the plant out and rinsed off its roots. We blended 2 jalapeno peppers and 6 cloves off garlic in the blender. We add some water and sprayed the plants,roots. and new soil with the spray. And we sprayed it's leaves. Then we put it by my window. It's been 3 days and its all wilted! I really don't want it too die! Any suggestions?