I had that same a couple of years ago, with a total lack of intererest in everything I loved.
I was on medication for depression too, my fav hobby was fishing.
I sort of felt I wanted to go fishing, I knew I liked fishing, but when I actualy thought right I am going fishing today, my brain would say " But it's all the bother of getting the gear ready, loading it into the car, dragging it down to the lake, setting it all up, then it will probably rain, then if I catch nothing it's a waste of time.
End result. I think I will leave it today.
Well thats part of what is was like for me. Nowdays I could be sitting at home doing nothing, the thought of fishing pops in my head. I am out the door within 5 mins.
I guess if I sat and thought about it now, I could easy put it off till tomorrow, but why put it off till tomorrow when you can do it today !
Maybe you should grab your camera, go outside in all this wind we have today and take a few snaps, you might remember its more fun and relaxing again, ok your gona get cold but you don't have to do it all day. lol
Hope my story helps in some way.
Eliminator.