What Causes Feeling Of Sickness After Normal Delivery?

Female, 34. 140lbs, 5'1", 6 months postpartum, normal delivery but was readmitted to hospital 1 day after discharge for unknown infection, treated with IV antibiotics for 2 days then discharged. Newborn was admitted to hospital 1 week after delivery with unknown infection, also treated with IV antibiotics for 2 days then discharged. Although it has been 6 months since delivery, I still feel very sick. Most days I cannot get out of bed. I