I'm done.. rant*

I am not looking for judgement at all please skip over if you have something negative to say.. I am just done. I am 27 weeks pregnant with my third child and I pretty much do my other children by myself because my husband works night shift, I love working but I havent since my son born because we couldn't afford daycare ( my checks would go only to that.) I am so wore out and my 2 yr old constantly climbs all over me and my 4 yr old doesnt mind like she used to. I dont know what to do anymore. I am not the perfect mom at all and I dont try to be but I am hurting really bad in my lower abdomen and my siatic nerve and I absolutely feel defeated. I am going back to college August 12th to further my career (online classes )and I am just feeling like how can I do it when it's already this hard and she isnt even here yet? I am just over it. Sorry for the rant and long post.