Second pregnancy nightmare.. help/advice?

I've been so sick since very early (when I didn't know I was pregnant yet) couldn't eat for atleast 7 weeks. I'm 10 weeks and a day now, and still consistent nausea. This Fatigue is horrible. I am so tired I feel like I can't do anything daily. I also have a 9 month year old daughter. She hasn't been sleeping. I haven't been sleeping yet I'm beyond exhausted 24/7. My fiancé works full time working 10+ hour days, by the time he gets home he can barely help me with our daughter or anything really. I feel so helpless, frustrated, angry, depressed, stressed out and guilty that I should be able to do more and I just can't. I can barely survive days at work, im a total sloth and feel like I'm not going to be able to work anymore like this...or that I shouldn't be in this condition. I have no one to watch my baby anyway, except my mom, who is recovering from an emergency open heart surgery 3 months ago, with possibly another surgery pending. I feel like nobody understands how terrible I actually feel this time, like I'm overreacting and they just blow it off like its nothing. I'm trying to be excited for a new baby and I'm happy the baby is healthy so far, but this is so hard already. I just don't know how im going to be able to do this and what to do anymore!!! Advice or anything? Please. 😕😭