Little venting , I’m miserable

I was looking forward to the end of my 1st trimester I’ll be 13 weeks on Wednesday. I was hoping my sickness would atleast be minimal but I’m always extremely nauseous to the point I’m in bed literally all day. Just getting up to walk to the bathroom is a lot for me …I’m tired ….I throw up sometimes when I eat. I feel hungry but when I eat sometimes it makes me more nauseous. I work in a hospital but good thing I’m per diem so I can choose my own schedule and I had to schedule less days ( 2days a week) which is of course messing up my income. Good thing my husband works but he’s not well off income wise….I’m pregnant with my 3rd child and as much as I did think about having a 3rd child now that I’m actually pregnant so much fear and doubt of having 3 kids is running through my mind. All I hear about is how hard it will be and how much my life will change “drastically” with a third child. Right now I have two boys a 12 year old and a 2 1/2 year old. My due date is the same due date I had with my 2 year old so their birthdays will either be the same day or for sure same week. When I give birth I will have a 12 1/2 year old and a 3 year old.