Don't 'do' anything right now, you need to grieve for the loss of Leyla.
I understand the feeling that you are not done. When my second was born, I knew the moment I had him, I wanted another. I still feel guilty that I felt this way even as I sat in the hospital with my newborn.
His birth and my pregnancy was traumatic and I had really almost died. Then, he needed speech and OT services and my husband said enough is enough so I thought, 'Okay, I will always wish I had my girl but I can live with my two beautiful boys.'
So then I went back to work and we bought a second house. Decisions that to me meant I had to moved on. Four months in our new home, I found out that I was 16 weeks pregnant with a baby girl.(I didn't think I could get pregnant again after the difficult conception / pregnancy with my 2nd). Since we had given everything away a baby needs, we had to start new. I also started being a stay at home mom again.
She is almost 10 months now. I am trying to live in each moment more than I usually do because I know she should be the last one. Money is tight. We thought I was going back to work permanently. But, I do feel more 'done' now having children.
You are not crazy but give yourself time to heal and enjoy the children you do have. You never know what may happen in the future.