12 weeks

Im feeling worst right now that im 12 weeks 2 days. I have nausea all day and having diarrhea. I feel so tired. I thought that pregnancy gets better during the second trimester. I just want to cry. I cant even go outside right now because i want to vomit. I actually went shopping with my sister yesterday and smell food and feel so nauseous . I was scare i wasnt going to get to the restroom in time. Nobody in my family knows im pregnant so its getting very difficult to hide it. My husband and i are telling everyone in christmas eve, not even my 2 kids know. So back to my question have some of you felt worst passing 12 weeks? If you have ,when did you start feeling better?