Sounds like belly dancing is a good option for you. The great thing is that it's a lot of fun, so there are a lot of laughs and it's a great way to unwind from the stress of the day.
Belly dance also tones the body in a feminine way as movements originate from the torso, so you get toned curves, rather than a body builder shape. Also the flowing movements can be very relaxing and calming, and the shimmying movements are a great massage for the body.
You will probably want to look at your diet too, a nutritionist can be a good option. Make sure you have plenty of handbag/ glovebox snacks for busy days and ensure you eat at regular intervals - I like the 'food doctor' bars for this.
Feel free to contact me for more info on belly dancing.