This may not be very good advice...but I've been there, and with morning sickness I missed about two months of school..and I had to drop out and do everything online...which is 10x harder cause you have to dedicate yourself more, but it's better if you have odd hours...but I did it because of the same reason..it was stressing me out and I was afraid for my baby!
I would suggest talking to a school counsler about everything or your parents and ask them what they would be willing to help with. You may even want to see a therapist, to see if they can help you cope with all the stress of everything..which probably sounds kinda scary but trust me, it will help immensely!!