Is there any mom's out there who have anxiety/depression and have suffered from post partum…

Is there any mom's out there who have anxiety/depression and have suffered from post partum depression after having their baby? I'm in therapy working on coping mechanisms to help with the disorder.. My son is 2 1/2 years old and my husband and I have just started talking about maybe trying for another baby. I know I want another baby, but I'm so afraid to actually get pregnant and have my depression trigger again after having baby no. 2.

The depression sucks so much energy from me that I'm exhausted on top of the exhaustion that comes with being a mama, so that's another reason why I'm nervous to get pregnant again because I can only imagine having two children causes one to be even more exhausted than having just one! I want to be the best Mom to my bab(ies) so if I could figure out the mental exhaustion I would be ok with just being exhausted from being a mom to two kids! Lol

Is this normal? How do I overcome this? Any suggestions or comments from anyone who has gone through this?