how to GAIN WEIGHT

Stephanie
I'm a recovering anorexic  
I have a wedding next year and the dress I got is a size 6 (Australian size) I think that's a size 2 in America 
The dress is just a tad big around my boobs and ribs 
I'm needing to gain weight quickly and to keep it on 
I work full time as a child care teacher so I'm always on the go and very active with the children 
I eat a lot of junk food e.g take away food maccas KFC Chinese and a lot of chocolate and chips 
At the moment I weigh 40 (88-99 pounds) 45kg I haven't weighed myself in so long