Unfortunatly it can rear its ugly head again the third trimester, and it can be worse than the first trimester. I experienced MS from about 6-20 weeks, then it went away, only to come back again at about 28 weeks. I can still be sick in the morning, but it has settled now. I would certainly go and see your dr, it can be exhausting feeling/being sick all the time, when you are already tired. xo