Rosa rugosa, with sad, it's not so much mood, like "I feel sad today" it's actually depression, as in I can't get out of bed because I'm pretty sure my body weighs 7,000 pounds and it takes me 20 minutes of standing dazed in the kitchen to decide to eat cereal. Not to fix the cereal, just to decide to eat it.
and like depression, all the things that are too hard to do can help - exercise, healthy eating (and appropriate eating, there have been studies done where some people are "carb dependent" sufferers, some are "protein dependent" and some are neutral., regular sleep...
i think I actually caught mine when I shifted my focus a few weeks ago - part of my "exhausted, overwhelmed" may just have been too much time in the basement with bad lighting.