He becomes consumed with repairing/searching things to the point of staying up all night. When offered an alternative or encouraged to take a break he becomes aggressive. This behavior is affecting his meds routine as well because he won't pause what he is doing to take them. Thoughts?
If you know how to fix things, make it a competition on how you would fix something compared to what is being shown in the TV show, but always let Dad win :) Or if you are not familiar, you can ask Dad to explain it to you. He might enjoy being the instructor, and in turn it will give you extra knowledge.
Long time ago there was a Canadian TV show that was shown here in the States, called "Red Green". It was so very comical as Red Green would explain how he would fix something (usually with duct-tape) or make something out of stuff he had laying around in the garage. My sig-other who was not handy couldn't understand why my Dad and I were rolling on the floor with laughter :) I believe the shows are now on YouTube.
Best of luck with a difficult situation.