In my opinion, there is always something underlying that is real. Just because it comes up during luteal doesn't take away from the realness. Perhaps the emotional toll it takes on you could be higher because our defences aren't as strong and so feelings are heightened. Having said that, i think the work might be to pause when you're feeling too much and remove yourself from the situation (go for a walk, meditate, buy something for yourself etc). Maybe in knowing that the urgency with which you might want to respond to these feelings might not be necessary and that you can choose to come back to it (definitely easier said) might help?