How to deal with exhaustion?

So, I meditate every for more than half an hour during the evenings and also five minutes session every one or two hours during my work so I keep myself calm all the time(not every day but I am trying to do in these lockdown days) but what I feel is I easily get exhausted from my work which involves only heavy mental activities. But otherwise if I let myself refresh doing things which excites us like joking with my friends, watching fast beat songs, etc. I can continue my work feeling energetic. But the downside of this is I easily get carried away with the stuffs I do for refreshing or even get stressed with my work. How to balance this?(physically i am weak person due to medical problem)