Mom, how long does morning sickness last? It's been going on for weeks…

Mom, how long does morning sickness last? It's been going on for weeks and it's getting worse. I'm 30 weeks pregnant but still feel nauseous. It gets worse when I'm hungry. So far, everything has been okay. Last week I was admitted because I had pain. The doctors said I couldn't have a baby at 29 weeks. They had to stop the medication with a drip. Now the problem is this nausea.