There's another psychological phenomenon called "depersonalization" which could also describe your situation. But it's difficult to distinguish it from depression, because they both overlap and some people can be depressed without feeling depressed.
Probably the worst thing you could do would be to intellectualize it. EVERYTHING seems boring when you feel this way. Like pain, it's your brain's way of telling you that something needs attention. You're sick, in a way, even if you don't feel anything.
Have you tried medication? It can be temporary. It doesn't have to be a roller coaster of trying, failing, and blowing money on expensive new drugs.