Waking up with ailments

Why is it when you're in a foreign country it's quite normal to wake in the morning to be greeted with some strange affliction? Since being here I have suffered somewhat; swollen tongue (different parts swollen, usually one side one day, another side the next day), wrist and hand swollen and very itchy and very hot (but no bite mark, nothing), inside of nose really painful, tummy stabbing pains and this morning severe pain on the inside of my right foot (a red mark which won't let me put pressure on it).

What is happening during the night that is causing these unwanted occurrences?

Strange...