I am exactly the same measurements as you iwannabeayummymummy!! So while i appreciate there are others on here who have more to lose and don't want to be insensitive to that, i can also appreciate why you want to lose weight so much. I found that when i wrote every single thing that i ate down that i was actually eating more than what i thought i was and more than what i should be if i wanted to lose weight. Have you tried doing a food diary? Also i can't afford to go to the gym at the moment because i am on leave from work (finishing uni) but i have wii fit, my fitness coach and ea sports active at home which i have been using regularly between 30-60 mins a day and that has also been helping me to feel energised and motivated, plus it means that i don't have to completely give up on having a glass of wine with my meal as i can usually burn it off with the exercising
Sorry that i can't help with convincing your doctor, it is really important that you have your GP on board if going down the diet pills route in case of bad side effects (have seen some really nasty stuff on the internet about people who have reacted badly to it!) - but maybe if you can show him/her a food diary and keep track of any exercise you are doing then he/she will really see how hard you are trying! Good luck and if you want to do this together i would love to have a buddy - i really want to have a summer where i am at my ideal body weight of 22 BMI!