Postpartum depression

Totally confused if I even have it. My regular doctor wasn't much help but they are referring me to a therapist or someone to talk to. Yesterday he gave me a 3 week sample of Wellbutrin. My baby is 10 months since he was about four months I have felt this heavy feeling of fatigue, loss of energy and with that I'm realizing now I'm some what irritable from time to time. It's affecting my work. I still live my life, love my baby love my fiancé. We laugh, go shopping etc. I keep up with house work and I also work 40 hours a week. But I feel so rundown all the time. The feeling of exhaustion in my eyes is almost indescribable. The doctor said to me you don't seem depressed. My friends say the same thing. But I'm at a loss. For now I'm going to take the pills the doctor gave me and wait for a health professional to get in touch. In a way I'm hoping this is postpartum depression because I can't take this feeling anymore 😬 and I'm getting married soon I want to celebrate without thinking about how fatigued I feel.