Ok so I’m only a scientist not a medical doc so always always go on what your doc works out with you 👍
With most of those you’d generally try to wean before the end but it’s a balance - if you’re going to be so sick it’s dangerous then your doc may prefer to keep you on them.
Metoclopramide mainly has effects on the mother but some docs may prefer to take you off it to avoid any extrapyramidal effects in the newborn.
Cyclizine is an antihistamine - again generally ok, some risk of respiratory depression but that can be monitored and is preferable to severe illness in the mother.
Pred is a steroid and as long as you’ve tapered to the lowest dose that controls symptoms then this too can be taken up to birth.
It’s inportant to talk to your doc ahead of time about any changes in medication as birth approaches. I was very clear with mine that one of the most distressing things for me in my first pregnancy was being dismissed and talked over - it left me feeling really distressed and vulnerable. I need to know and understand what’s going on. A good doctor should be able to explain what they are planning and why at any level of patient understanding.
Sorry to be the harbinger of doom but stretch marks are pretty much untreatable. It happens when the skin is put under more stress than it can stretch to accommodate. It’s largely genetic and nothing you can put on them will prevent them. Don’t stop the cocoa butter though - it feels and smells good and while it won’t prevent them it will keep your skin feeling nicer. Mine from last time are silvery now but you can still feel where the skin has been damaged.