Hi L.,
Go back in and talk to your OB/GYN. Tell her you haven't felt the same since having your daughter, that you're still crying alot (15 weeks is too long) and don't feel like you're bonding with her. The bonding issue is big; you want to get yourself back so that you can bond with her.
I suffered post-partum with my first and only daughter nine years ago. My husband was concerned, because within the first few days I didn't seem as if I was bonding with or was excited to have her. My OB put me on Zoloft; I was on it from April until Dec. After that, my hormones were back in line and I was able to go off it. I knew I wasn't bonding with my daughter, but at that point, I really didn't care. After I started the meds (within days of having her), I was holding, hugging, kissing, and marveling at this wondrous little girl God had given me. My weeping stopped, and I felt like I'd gotten my life back.
You deserve to be happy, and your daughter (and son) need their mother. There's nothing to be ashamed about; childbirth does an enormous number on the hormones. Not everyone can bounce back without some help. You've done an admirable job, trying to get better yourself. Now, it's time to seek some help. Trust me. You'll be feeling better within days.
Please keep us informed as to how you're doing.
A.