Migraines in third trimester

Long story short, before getting pregnant with my second baby in 2017, I was diagnosed with chronic migraines. I was on a prescription before the pregnancy, off during. During pregnancy my migraines seem to easy greatly. Except this time. With my third it seems like not only am I having more, they’re 10x worse. To the point that I can barely function. I have 7 1/2 weeks left and I don’t know what I’m going to do. Typically I take Tylenol, drink a cup of coffee and lay down. Most days that doesn’t help. I can’t have my prescription while pregnant bc in studies it showed to increase chances of baby having cleft pallet. So my question is, what do you do to cope? This is the first pregnancy that I have had issues with relieving them. My first pregnancy in 2015 is actually what brought them on. They started during the pregnancy and never went away.