My husband was diagnosed with AD about 1 1/2 years ago.  He was put on
Reminyl and he was doing very well - less irritabiliy, etc.  His Mother had
AD and a half-brother also had AD.

In the past month he has become obsessive about things (or it seems
obsessive to me anyway).

1.  All of a sudden he has been going to estate sales and buying 2 or 3
truckloads of stuff and then taking some of it to second hand dealers.
(History - he's a farmer and has always gone to farm sales to buy things he
actually needed on the farm).  Now, he's buying stuff he doesn't need to
trade, sell, etc.  When I would question the things he buys, he gets really
irritable with me.  We don't have a lot of money, but he insists he's making
money.  He makes many trips to the sales, the second hand store, etc. and is
spending a lot on gas.  He's 72 and has decided all of a sudden that he
needs a bike.  Brought home 2 bikes from the second hand store that he says
he's going to repair and sell.  Got on one of them to ride it, couldn't
figure out why it wasn't going anyplace - no chain!

2.  He bought 2 wire shelving units, put them up on the bathroom wall and
took just about everything out from under the bathroom sink and put all of
it on the shelves.  When I told him it looks tacky (this is the bathroom
that visitors use), he got angry with me.  Today when I got home he was
putting 'another' wire shelf up in the same bathroom.  When I told him again
that most people keep that stuff under the sink, not on the walls, he said I
don't like anything he does.  And, so it goes . . . .