Does anyone know!? HELP!?

Ok...I just had a baby. I AM NOT FEEDING && I am RAPIDLY losing weight. It is now to the point where I look disgustingly skinny! I dont really have an appetite...or if I do, its like I can't take much in. What is wrong? && what can I do to gain around 10-15 lbs within 2 weeks...if it is even possible? I know eating helps. But what foods should I eat? Preferably high calorie! Also, are there any supplements/medications I can take? I know on "Mean Girls" lindsey lohan gave regina "Kalteen" bars that made her put on LOADS of weight...I know it isn't real...but is there anything similar!? that would be good.