Overactive Appetite

First, my history:
About 4 years ago, I had a pituitary tumor removed and then I lost a ton of weight. The pounds came off easily once my hormones returned to normal and I finally reached a healthy weight for the first time in my life. Three years ago, I quit smoking and put on about 15 pounds. I didn't try to lose it but I was still healthy and felt good about myself so that's where I stayed. A year and a half ago, I got pregnant and gained about 60lbs. Within a month after giving birth, I was 10lbs away from my prepregnancy weight. I was breastfeeding and not overeating because I wasn't all that hungry. In fact, I had to use MFP to make sure I was eating enough to provide proper nutrition to my baby. At 6 weeks postpartum, I was put on an antidepressant for postpartum depression. That sent my appetite into overdrive and no matter what I ate, I was always hungry. I gained 30lbs in 3 months. In total, I gained back 50lbs. I switched antidepressants after 3 months and my hunger subsided a bit. By the time my baby was 7 months old, I was completely off the meds.

Now:
My baby is 9 months old, I'm off all meds, I'm 50lbs overweight, and I still can't control my appetite. I've experimented with eating different foods, proteins, fiber, increasing my water intake, etc. I'm still hungry. All the time. It dawned on me that the only times in my life that I didn't feel hungrier than a normal person were after I got that tumor out of my head and those few weeks postpartum. My hormones are all normal now so that's not the reason for the hunger.

If any of you have some ideas why I might be feeling this way, please share them. I'm open to anything. Like I said, it's pretty much been lifelong. I've talked to doctors and they don't know the cause. My weight is starting to really bother me and I have no clothes that fit for summer. I don't have the money to go buy a larger wardrobe either. I'm very self-conscious now.