Weepy

I'm not sure if it's post holiday blues, or the awful Michigan winter, but the past couple weeks I just feel tired and weepy. I'm almost 13 weeks and everyone keeps telling me my energy should be coming back, but I'm not really seeing it much. Bursts of it once in awhile. I vomited for the first time last week. I sleep well at night and 4-5 hours later my eye lids are so heavy and I just want to cry. What is this??