Depression and breastfeeding

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Hi,
I am 23 years old and after having my daughter I became a little depressed. Which, I think made me gain more weight. I am breastfeeding which I thought would help me lose weight, but my Dr said that isn't always true some people gain weight because their body is now storing fat for them and the baby. So I am looking for help with motivation to keep up with what ever I chose also for help with losing weight and breastfeeding. My Dr says I need to be cautious with my calories because if I don't have enough I will dry up.

Any advice helps, also some people to work out with through the app would be nice, on the app it says people do better with friends.