Okay, deep breaths. Focus on the head pain, not the nausea. This isn't the worst it's ever been. Things will be both better and worse, and this is just one more thing you have to endure in this process. Remember why you're doing this? So you can get pregnant and be even more nauseated for even longer. Then so you can go through L&D and come out the other side with a pooping, screaming, adorable little baby. So it can drain every resource you have until you're barely standing. This isn't the worst you will face, and you were made for much worse.
Things will get better, too. There will be good moments. There will be Zofran here at some point. There will be Tylenol, too. And you'll probably get used to the shots and antibiotics and tons of meds all at the same time. Everything will eventually stop spinning, and you'll wake up feeling like new. Or you can just stay in bed feeling terrible. Either way. Deep breaths. Focus on that baby that will someday be here.