1. Have a w*nk to get your blood circulating (seriously)
2. Have a shower
3. Get some paracetamol and electrolytic solution (a pinch of sugar and salt in water) in you. Beechams Resolve is the same thing.
4. Eat something with carbs and some egg.
5. Go for a walk.
Have a tattie scone cheese and onion roll with brown sauce and a bottle of Currys Red Cola and then a cup of strong tea with 5 sugars in and you will feel like a illion dollars in no time.