Exhaustion making me sick

Hi ladies. I just need to vent a bit. I have an 8-month-old baby girl and left my job to look after her. I do chores at home, cook, and take care of her. I was coping, but now I'm not anymore. I'm crashing out. Everything feels like it's too much. I haven't done anything nice for myself in a while, and finances have become tight. Lately, I've been beyond exhausted to the point where I'm starting to feel sick. I can't eat and feel nauseous. My body aches all over, and I've developed a bump at the back of my neck. I'd usually release by crying, but I feel like I'm going numb. I'm considering seeing a doctor at this point. Have any of you experienced this, and if so, how did you deal with it? I'm a first-time mom.