I don't drink in the week but on a Friday or Saturday evening we go out for a meal or meet friends in the pub for a few drinks. I drink wine or vodka usually. For the past few weeks I have woken in the night after a night out at around 4am feeling terrible with palpitations, headache and pain I my stomach. I usually get up and drink a couple of glasses of water and take some paracetamol and then it takes an hour or so for the palpitations to stop and I can go back to sleep. This has been happening for a couple of months now. Has anyone else had this and if so what is the cause? Any help would be great.