Losing weight fast.

Hello everyone, I am 25yrs old and I weigh 295lbs. I gained much of the excess weight when I was pregnant with my daughter 5yrs ago and since then I've never been able to shed more then 20lbs before it stops coming off. Including with help from personal trainers, doing the insanity workouts, eating healthy and very little portions throughout the day, etc. Now it's just overwhelming because while I'm ok being a plus size woman, I feel like it's taking its toll on me and on my ability to get pregnant again. I want a 2nd baby and with my previous fertility issues (cysts, irregularities) I don't want the weight ruining my chances even more. So, does anyone had any ideas to help me shed the stubborn fat in a semi-quick time frame. My fiance and I have been trying for baby since May. I need help!