I've gone through that funk a few times myself Brian but I always pull back, shift gears (maybe switch for a while to completing late 50's Topps sets) and come back to pre-war. I hope you hang in there.
As far as the investment angle, most all of my cards are worth more than I paid for them over the years, even though some sets have slipped lately, so I'm good.
Take a deep breath, put together an Ex-Mt 1959 Topps set card by card and then come back to pre-war