Try something else, not running, mix it up a bit. Continue to run once or twice a week or drop it entirely for a little while and see how you feel then. The real goal here is fitness and exercise over the long term, right? You won't get that if you keep trying to do something you're hating, and you also won't lose your current fitness for the 5K if you're still exercising. Not fast anyway.
I totally get where you're coming from on lack of progress. I'm right where you're at right now with endurance, being able to run a little bit over two miles straight but feeling very beat up at the end of that time, and it's so hard to want more and not know really if or when it will ever come, just having to take it on faith that it will, given enough time and effort. And I love it right now, and it's still hard.
So what I'm saying I guess is maybe a little bit of a mental break would be beneficial, both in terms of long-term goals (keeping up exercise at all) and also in terms of liking running again -- get away from the numbers for a while and just enjoy the movement. Even if you have to walk part of the 5K when it comes, or choose a later one instead (or even drop the idea entirely for a while, whatever works).
Height 5'8 1/2"
GW: Originally 150. Maintaining at about 146 since June 2013.
5K 4/21/11: 31:55
|29 Maintenance Weeks