I had horrible first tri mestets for both of my childern severe fatigue, vomiting, lightheaded, but hang in there I didnt see an improvement until12-13 weeks along I started to feel better than for the rest of the pregnancy felt great. Had a few fainting episodes which was scary but hang in there it should get better. I unfortunately could not work either during the first 3 months but I was able to return after the first 3 months of pregnancy. Hope you feel better soon, the extra blood volume in the second trimester should help once the hormones settle from the first few weeks.