Can't keep good down

I'm 14 weeks now and the last week or so has been awful for sickness I've had anti-sickness tablets but been no help, any food that I have comes back up and even the thought or smell of food is making me sick, I'm trying to eat small snacks when I think I can stomach it but even this proves difficult sometimes and I'm worried that I'm not eating enough to provide the baby with everything it needs, I am taking pregnancy vitamins too and drinking plenty to avoid dehydration but still worried it's not enough and not sure if I should just keep eating lightly when I can or try force some meals down. My husband is getting really frustrated that I'm not eating meals everyday but he doesn't understand how hard it is to get it down when you feel sick to your stomach to the point where I'm gagging while I'm eating, anyone else suffered like this?