Has anyone had severe nausea in their second trimester? I had constant nausea with no vomiting in my first trimester. I am now at week 21 but I've been extremely irritable, with no appetite. I get random severe bouts of nausea with lightheadedness, and sometimes my muscles feel very tired. I also have slept a lot this weekend, with 10-12 hours each night and naps lasting up to 4 hours. Just now I got the sudden onset of nausea and could barely make it to the restroom in time to puke. Now I feel okay but was wondering if this is normal. It is beginning to affect other things like work, my marriage, and normal outings.