Routine

Hey!

Is this normal or just me? Normally, on a Sunday or after a long time of being off work, I get super sad and drained. To the point where I feel like life is pointless and I shouldn't be here. I'm not sure if it's because I have to go back to the normal routine of constantly being overstimulated and burnt out at work or if it's something else. It always happens after I've had a lovely week/weekend with loved ones and I don't want it to end :( 

Any advice?