Postpartum depression

I'm 7 weeks pp, and unfortunately I wasn't able to bring baby girl home due to her passing away at birth from thanatophoric dysplasia. I've been so depressed my doctor put me on meds and there not helping, I swear I'm loosing my mind. My husband doesn't seem to understand my mood swings, since I can go from extremely happy to crying my eyes out In about 30 seconds flat. I miss my daughter so much and it doesn't help seeing new mommy's with baby's everywhere I go.I have a 5 year old son. And I know I have to be strong for him, It's just really hard.Sorry I'm ranting just don't know what to do.