Postpartum anxiety

Im almost 11 weeks postpartum and have been taking Wellbutrin for almost two weeks. I no longer feel sad but my anxiety has gone to extreme levels. I stay up all night watching my baby sleep, I’m scared to do things, every time my baby does something I think something is wrong with him. I feel like it’s getting worse by the day. Today I was sitting and holding my baby after being up 24 hours straight and I swore Ilhe was blue, I did a double take and saw his chest moving and he was fine, but I feel crazy and out of control. Has anyone experience postpartum anxiety or is currently experiencing it? What helped you the most?