Has anyone noticed there tolerance and patience levels are depleting?

Bowser • 🌈🌈 due March 2016
 I've noticed I'm finding myself more irritable lately, my tolerance for my family(parents and siblings) is gone and I just cannot bear to be around them! I Do snap but I bite my tongue alot. 
I don't remember being like this before. 
I dunno what to do to stop it. Or control it more. Or if it's even normal!
Now my OH seems to think its actually ok giving the circumstance of what they are saying and doing. He says they are just being stupid and mean to me. 
I haven't lost it with my son. I've snapped at my OH but he torments me so it is deserved.