Any tips on rapid weight loss?

Hi im 5ft 3 and just over 15st i really really want to lose weight for not only my health benefits but for personal reasons like i wanna look good for my friends wedding and my holiday. i tried sliming world and it started ok but my temptations got the better of me and i was not gettin anywhere, so recently i tried a standard healthy diet but i just cant do it my parents eat rubbish and i dunno what to eat makin me more stressed causin me to eat moe fast food. any tips welcome. Im going back to see the nurse next tues and im hopin she will help.