Depressive features are more or less the same,Post partum depression only means the symptoms started within 3 months post delivery.However its unlikely it has lasted for 2 years .You need to meet a psychiatrist and get urself evaluated .
Next Steps
https://psychology-tools.com/test/zung-depression-scale
this is a self evaluation tool to better assess yourself
Health Tips
Lot of hormonal other physical and psychological changes happens after pregnancy,it's indeed a challenging phase for mothers.Dont worry you will be fine soon.Make sure u so some physical activity , supplement Vit d3, Check
thyroid and meet a Psychiatrist