Don't know what to do

I've been a little stressed, and my emotions are all over the place. I really need to talk to my husband about the stuff I'm feeling and concerns I'm having with our marriage (they're not major things but stuff that's bothering me that's just been adding up) and I have absolutely no idea when to talk to him.

His work has been stressing him out lately, it's complete shit show right now. He's tired and burnt out because of it. He's only had 2 days off this whole month. So I don't want to add more to his plate. He also has to go out of town tonight, so it's like do I bring these issues up before he leaves? I can't keep bottling my feelings though since I'm about to explode. I have to get this stuff off my chest. I just don't know what to do 😔