Hey, don't worry, you're not losing any talent that you have! I used to write stories and things all the time, and I know just from that experience, that writer's block actually does exsist, it's not just a phoney excuse we make up.
Unfortunately, I can't tell you exactly what to do, because everyone is different, and has different ways of getting out of their writer's block. And also, I've never really wrote lyrics to a song myself, just stories.
But either way, I'll tell you what helps me get past it: music!!
I listen to really, really inspiring music!! Like, for example, if I wanted to write a special love story, I'd listen to something that really gets ideas flowing in my head! Like this:
http://www.imeem.com/jazzmusic8/music/-7…
Or if I wanted to write about something really dramatic, intense, or action packed, I might listen to something liiiike....this!
http://www.imeem.com/robertalvis23/music…
Hope this helps any at all!