What to do if you feel that there is no energy to do something?

When I have to make myself go through such inevitable thing, which I strongly dislike, a lot of my brain’s energy reserve is lost. And because of this, my productivity becomes very low for the rest of the day. I have to go through such things, several times a day(and yes, I have a miserable life). I want to ask that is there some sort of life hack by which I can increase my reserve energy level? And also recover my energy faster? I walk for half an hour or sleep for 2–3 hours to recover my lost energy but this is not always feasible, keeping 24 hours a day in mind.