Bless you for what you have been going through. I know it must be tough...but Sunday is just around the corner

As for the sickness, hopefully that doesn't last too long either. Without making it as though you are hurting her feelings, can you possibly tell her that her smoking is contributing to your feeling sick, or that it makes you feel sicker when she smokes around you?
As for worries about when to feed the baby, etc. that will all come to you

You need not worry about that now as you will know what to do. Your baby will let you know, usually. If your baby doesn't let you know or tends to sleep quite a bit the first week or so, make sure you wake him/her up for a feeding every two hours throughout the day. Other than this, that's all you will need to know about feeding your baby.
But, like I said, don't worry about that now

You will be fine and will be a good mom

Truly hope all improves for you soon!