Thanks for writing. If you were watering it every day and then got some heavy rains, it might have gotten too wet. When this happens, the roots start to suffocate and die. When roots die, the plant starts to lose leaves and new growth. If you think this is what happened, then letting the soil start to dry out between waterings will definitely help. By the way: Does the pot you planted it in have a drainage hole? If not, I'd definitely repot it in a container that does have drainage so exess water can escape.
The other thing that sounds possible is too much fertilizer. When you fed it, did you follow the directions on the package? Too much fertilizer will damage the roots --- and just like with too much water, the plant responds by losing new growth and leaves. If you think you might have used too much Miracle-Gro, the best thing you can do is run lots of water through the soil at one time. This will help dilute the fertilizer. Once it's diluted, the plant should start to grow new roots and then new shoots and leaves.
---Justin, Senior Garden Editor, BHG.com