Need advice!

A year and a half ago I weighed 156. I am 56 and that was a good weight for me. I look healthy and 'normal". I have a hormonal imbalance (too much testosterone for a woman) and was put on a corticosteroid. I gained 25 lbs in a month! then I found out i was pregnant. I was sick for the first six months and only gained a few lbs. but in the last trimester i gained from 180 (at my first visit) to 223 when my son was born (he was even three weeks early!)...during my pregnancy I was very swollen and even had to get a sonogram on my leg to make sure I wasn't so incredibly swollen from a clot...well my son is almost ten months now and since he was born i have been battling with weight loss.When I came home from the hospital I weighed the same amount as when I went in, 223! I didn't even lose the 6.5 lbs my son weighed! I wasn't strict at the beginning because i was nursing..but when he refused to eat from me at three months I signed up at curves. I would go at least 2XS a week for a month and attend their aerobics classes...i was on Atkins (sort of, just basically ate veggies and protein without calculating carbs) and i could barely break losing 5 lbs. I obviously lost motivation and quit the diet. i went on a few diets between then and November...I went of the steroid meds while pregnant and then went back on the med in October. I gained 15 lbs without altering my diet:( I basically will be very strict for about 2 weeks and then either I see a small success and think i can cheat or i cheat and quit...Then about Christmas time my sister decided to challenge me (i love competition) to lose 8 lbs by the start of school on January 17th. I was good until Jan 5th cuz it was my birthday and once i break it, its hard to get back on! but on January 10th I decided thats it. I lost the 8 lbs for the start of school but since then (about a week) i havent lose a lb! I try to exercise, i was good about walking between january 10th and when school started but now I have no time to even walk for a half hour! So, I was wondering if anyone had a similar journey as mine. My situation is different due to my slightly high levels of testosterone...someone with this hormonal imbalance has a harder time losing weight. Basically i just want to be successful! I am sick of being fat and feeling ugly all the time. I think about it constantly and feel like others think the same! Oh, I weaned myself off the steroid because I am so unhappy with the adverse effects of taking it (weight gain, water retention...) Please help me and my MUCH NEEDED success!! Thank you in advance!