Hungover swimming?

On Thursday night I went to my friend Katie's graduation from Cranwell. It wasn't too late a night and I didn't drink that much but unfortunately still enough to feel ropey on Friday morning! As I rarely drink, even the five drinks or so I consumed through the evening were enough to dehydrate me and make me feel really tired. Luckily I was off on Friday so could have a lie in, rehydrate and refuel! I really had to force myself into the pool and, once in, I had to force myself to complete the session. I did a short set of 2.2km but for most of the time was plagued by a splitting headache. I have been suffering from headaches quite a lot recently - I'm not sure whether the new routine has made me deficient in something perhaps? Unfortunately in Friday's session it may well have just been the drinking and the late night! Going to keep an eye on it and if they continue I think a trip to the Docs might be in order.