Pregnant and ZERO patients!!!

I’m 28wks the combo of the heat, cranky and bored kids (6 and 3) is starting to really get to me! I’m seriously getting so frustrated so easily. My hubby started 10hr shifts and isn’t home until 7 when they are getting ready for bed. I literally cried today because they won’t stop fighting and, well hormones. On days like this I wonder how I’m going to be a good mom to 3 if I’m feeling so stressed with 2? Did anyone else feel like this, or am I just going crazy?