We are also having unsettled times here, last week it was around dinner time, he would just scream, I suspect that he was tired and his teeth hurt and it was all too much. This week he has been waking up early or in the middle of the night when previously he would sleep through. I am convinced it is teeth. I think in your case it is probably teeth and missing Dad, babies are smarter than we give them credit for. Try putting Robert to sleep with DH's T-shirt or something that smells like him, that may help settle him, just spread it out under his head. I did that when DS was little to try and settle him.

Otherwise it sounds as though you are doing everything right. Have you got some support whilst DH is away? Sorry I can't remember if you have said previously. It must be so hard for you missing him and looking after an unsettled baby, my heart goes out to you.

Hugs
QB