23 weeks & really depressed

I honestly don't know what's wrong with me... I'm feeling so low/ depressed & really anxious. I feel bad because I am happy to be pregnant with my little boy & I'm so excited for September to meet him. But it's like every thing else is what's getting to me, work, my relationship, the way I feel about myself... It makes me question what kind of person I am. I want to be taking care of myself for the baby sake but at the same time I have no appetite for anything and I'm even struggling to drink water. I definitely don't want to harm myself or my baby I just feel really lost