I'm sure that if you are under stress, your dog can sesne it. If he isn't getting enough exercise both mentally and physically he could be bored and starting to get territoral over his yard/food/toys/personal space.
If his current life is out of routine, it will effect him. Things to consider.... how much longer until his life is back to the way it was, are you able to start working with him, walking, running, obedience etc.
If the answer is no, things will not be able to change, then you need to ask yourself if it is in his best interest to be a stud dog, and do you want to risk him hurting another animal within the household. Could he be a liability to someone if he escaped out of his yard?
I hope things work out for you and your boy