Really would like some advice from women that have fertility treatments?? plz help?

Hi im 21 and me and my partner have been trying for a baby for 3 yrs we have concieved twice sadly both ended in miscarriage :-( i have pcos and on the verge of diabetes....i was told to lose ten kilos by my gyno in 3months.....i have not lost any weight i have been on diet and excerise for over a month y arent i losing weight??? And also if i dont lose enough weight when 3 months is up will my gyno send me away with still no help until i lose the 10 kgs my and my partner are desperate to have a baby now.....could i get any other fertility treatment if i dont lose the weight?? Or do i have to lose the weight to get help at all??? Plz could u suggest anything that would help me concieve and have a healthy pregnancy so we can have the little angel we are soo desperate for now??? Thanx in advance plz share ur stories if u have been in a simular position and wat help u seeked....thanx