Irritated during 3rd trimester

I am in my last trimester with my first baby, Adalynn. I work full time on my feet on concrete. I started working at 25 weeks pregnant because I desperately needed the income. I am now 30 weeks and 4 day. I feel incredibly irritable and emotional. I’m starting to get very grouchy at work because I’m getting physically tired and so out of breath all the time. I also am feeling guilty for being so irritable towards my daughter, because she is hurting me with her movements and kicking and rolling. I’m a very small person so she really beats me up in there. She’s most active at night when I’m trying to rest and it keeps me from falling asleep easily. I also cannot decide when to stop working and start resting/preparing for my baby.