Might well be your emtaqbolism doing what mine periodically does and going 'No, had enough now'. Unsurprisingly it's doing exactly that after the houewarming.. I find usually a week or two off the booze and optionally some live yoghurt help it calm down again. And making sure you're properly hydrated too, especially now the weather's warming up. I'm still trying to soak my liver back into shape after the weekend.