Coffee could help, taking care of yourself could help. If it's not happening that often, maybe just understand that you'll probably have bla days and give yourself permission to be bla occasionally and have it not bother you more than it has to. Try to figure out if there are any patterns like not getting enough sleep or not eating well that seem to trigger bla days. I've sometimes found myself feeling like that and realized I literally just haven't eaten that day and as soon as I get some decent food in me I feel a million times better. It seems obvious but sometimes you just miss things.