I've been throwing up more lately then in the beginning of my pregnancy. I know it's not the flu…

I've been throwing up more lately then in the beginning of my pregnancy. I know it's not the flu because I can go back to eating again after I throw up. I thought it was because I wait to the last minute to eat but this morning I ate fairly close to waking up and 15min later I'm hugging the toilet. It's not just in the morning there have been a few times it's happened in the afternoon/night time. Has anyone else been through this? Did it last your entire pregnancy?? Did the dr give you anything to help or advice??