Thanks for hosting and giving this Season a theme I can relate to!
I'm right with you on the first 2 obsessions, and I'll throw in needing to repeatedly check if I locked a door (sometimes at great inconvenience), and when I was younger if I bought one album from an artist (and liked it) I would have to buy all their releases or try to - I think online shopping cured me because it takes all the fun out of the hunt.
I'm posting an original song about obsession via the insatiable pursuit of something 'Stronger'. (Lyrics added below at the request of our host.)
Stronger (original song)
Within a bubble scratching for seams
Bar all the exits from inside
Paper the windows to filter the light
Endlessly glaring eve or day
When all we need is something stronger
How many cracks to count on the wall
With one coat of paint to cover them?
Ceaseless divining for meaning in truth
Constantly asking what's the use?
When all we need is something stronger
Stack the volume over street noise
Move in colours to the pounding
Sirens cut through the thin veneer
While one more cry falls on one more deaf ear
When all we need is something stronger