2nd trimester nausea?

My whole first trimester I felt pretty good, never really got sick or nauseous, just reallllyyy tired all the time, but since I've been in my second trimester (just this week) I've felt like crap and all day today at work (I work 12 hour shifts) I felt like I needed to throw up and I couldn't! I got really dizzy and hot, couldn't really eat anything but had to force myself to. I kept going into the bathroom TRYING to throw up because I knew I would feel better if I did but I couldn't! 😩 anyone else feel this way now that they're in the second trimester??