i swear to you i posted a long reply to this now i cant find it
You are perfectly normal we all loose weight differently and your not alone on your stall periods i stall every other week or so. its frustrating but yes your body goes into starvation mode and holds onto every calorie it can BUT with some excersize those stalling points should get lesser and lesser. (i havnt excersized but i learned that from my doctor as well as one of my biology classes)
Dont be too discouraged you'll keep loosing but there are some rough points