Facial/wellness treatments after working around the clock for weeks

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, preferably in east London, for a really good facial (one that actually works not just massage some creams and call it a day) or any other wellness/beauty treatments that you would recommend after being a bit grim for a while?