Why does my OB not prescribe meds for morning sickness?!

This is my 2nd request and both times I have been told to try vitamins or juices, etc! This is my 3rd and with my first two (6 years and 10 years ago) I was prescribed meds like Zofran to get through the morning sickness but this time, I keep getting ignored! I love my OB but I’m ready to switch! Why is she doing this?! What has changed in the past 6 years? I’m older, 38, does that have anything to do with it? I’m 7 weeks 4 days and for the past two week, I have been in bed. I need to fill better so I can function, so I can go back to work and take care of my kids! I’m so frustrated! Morning sickness is worse this time around. I have tried everything, prego candies, small meals, ginger candy, ginger ale, crackers, etc! I just want to function for my family, my boys need me!