It may be a case of burn-out. Though I don't really see a way to get "away from it" for a while without totally ignoring all news/blogs/sources of information for this. Unless you were to go into hermitage... Or join the Peace Corps and focus on the specific problems for which you were signed up for. (My plan.)

Another point, that you may have to consider it all a work in progress. That the changes you work for are so momentous that they will not be fully completed in your lifetime. Change cannot be forced, nor expected to happen instantaneously - the latter being something that (Western) society is beginning to expect from all things in life. That you have to take a very long term look on society, like natural evolution versus genetically modified crops... The first is something you can track back, can slowly manipulate toward specific traits that you want - the second isn't something (really) that you can play with and expect what you want because there may be unforeseen consequences.