If something suddenly takes up all your time & energy, it's very helpful to be able to give it the necessary attention without it throwing things even more out of balance.
Direct deposit and automatic bill pay can really save you when what you most need to do to get yourself through a demanding time is to come home and think about nothing at all.
Drinking enough water and getting decent meals – especially breakfasts – and as much sleep as you can will help keep your body supporting the stress on your mental focus and your emotions.
Clear communication with friends, family and significant others can reduce the potential for drama, which is usually the last thing you need. Say something like "I'm winding up putting all my energy into [whatever is going on] and I'm afraid it's going to make me [spend less time with you, be unfocused, be unusually emotional, …]; I'm sorry in advance if that turns out to be the case and I truly do appreciate any slack you can give me while I'm getting through this." It won't solve everything, but it should weed down the number of "Why didn't you come to my party?" whines.
Most of all, be honest with yourself. Prioritize and let stuff go as you need to. Do some things well that are most important and skip or skimp on other things that aren't. You can't always do it all and that's OK.