Facial/other wellness things for when you have worked around the clock

Have been absolutely run ragged at work for the past 3 weeks (about 4 hours sleep a night and working weekends) and I look like a ghoul. Does anyone have any recommendations (I’m in east London so can’t do anything US specific) for a really good type of facial or any other wellness/beauty treatments that you would recommend after being killed at work and neglecting everything lol