Hi Ezz, just wondering how things are going now?
My DS is 6 months old and for the last week he is exactly the same as you describe your DS and I'm not sure what it is either. He is usually a brilliant sleeper but has been waking 2 to 3 times a night and during the day when he's awake he is so grizzly and his day sleeps are almost non-existant unless we're in the car or i cuddle him to sleep!
I'm so exhausted as well and just want my happy bubba back too, have things gotten better for you?