This is the eigth day in a row that I've had a headache. I feel it only in my forehead, kind of like a pressure. It can last hours but stops sometimes too. Yesterday I only had it once for maybe half an hour during the day and thought it was going to stop but then it came back in the evening. Walking in the fresh air doesn't help it either, nor does paracetamol. I've had it for most of the day today. It isn't painful as such, more of an annoying dull ache. I also feel physically tired and far sleepier than usual, a bit nauseous most of the time too. Is this a migraine?