Struggling with Work Training

Ok so I started training for a new job on Monday and I really have been enjoying it, great environment, great group of women, etc… come Wednesday after 2 nights of getting shit sleep and I can’t bring myself to get out of bed and go to my 3rd (what’s supposed to be mandatory) day of training. I am so irritable I feel like if anyone talks to me I am going to snap. But I also feel like crying because I feel like shit that I couldn’t bring myself to go. The days are long and I haven’t done long days in a while so it’s been a lot on me and I’m just exhausted, but like I know I can do this. It’s so frustrating I don’t know what to do I just want to be able to freaking function :(