Ugh , I need some help.

Jacqueline • Mama to 3 • Wife to my love • Eliana, Luca, Daelen 💕💕
So my son is now 9 weeks old , we have a 3 year old daughter as well . And since our son was born I cannot keep my energy up . I could honestly sleep all day long and still be tired . The baby is basically sleeping through the night now , with the exception of odd nights here and there . I am still taking my prenatals & have recently been put back on anti depressants , zoloft to be exact as I am breastfeeding . I can't think of anything else I could be doing to not be so ridiculously tired all the time , any other mama's feel like this ? And what did yall do to help ?