Ways to help stress and depression.....

I am very emotional lately, my daughter was born at 21w6d 5/19/15 passed after 15 minutes of birth and its been 8 months. I feel like I should be better at my depression but its taking over me, every month my period comes is another heart ache. I try so hard to be Okayy for my fiance but its so hard watching him with his 3 yr old daughter, how he loves her and acts with her, it breaks my heart that I can't see that with our daughter. I still have the anti depressant my Dr gave me