Is it ok to eat after vomit?

If you’re hungry, yes. Not steak and eggs obviously. Broth and crackers will do until your stomach has settled. You need to drink plenty of water, tea, ginger ale, or similar. If you are still vomiting after 24 hours, you should see the doctor to make sure you are not becoming dehydrated. This is all assuming you have a virus or bug. If you have ingested something, you should see the doctor immediately, and do not drink or eat anything.