M.B.
It sounds to me like something is physically bothering him alot. The ear infections make sense since the pressure can be worse lying down. Also, he may have food sensitivities - my older son did and was just not a happy baby. In hindsight, it was a reaction to dairy (and somewhat to gluten).
It could also be that he's just a baby that has a high need for closeness to his parents. My younger son is that way. The thing that worked best for us was to use a baby backpack in the house - and when we were out and about. We had two - one in the house and one in the car. In the house, you can cook, clean, etc. while carrying him around. It made a world of difference for us. A bonus is that after a little while up there, he may be fine to be on his own for a while. My younger son enjoyed it so much that he would go to the closest and want me to vacuum very often. We figured out to use this when were were out and about with my oldest son because we were spending more time carrying him that he ever spent in a stroller. As a result, my kids were almost always happy when we were anywhere. We used to get complements on how happy and well behaved they were. They tolerated confinement so much better up there because they could see everything - that kept them busy - they could see faces rather than knees.
Good luck - these days will pass faster than you might ever imagine!