Going into 2nd trimester

I thought going into your 2nd trimester was the easiest time, not for me. Ever since I hit 13 weeks I am seriously fatigued so much so I go to bed early and can't get up for work in the morning. I felt rude visiting a friend because I nodded off whilst at her house lol not to mention I totally freaked cause I ran my hands through my hair and clumps of it were in my hand. Definitely feeling worse than before!