The problem may be that you're trying too hard to relax, therefore causing extra problems for yourself. I know that sometimes, I can't meditate to save the life of me, but sitting in silence is still helpful, even if you can't properly meditate. Start small. Don't get stressed about it because that will only make it harder for you. Just try and relax.
I would reccommend just sitting in silence for a few minutes. Don't consiously try to meditate. Let yourself think, and pay attention to what you're thinking about. Instead of trying to clear your thought, listen to what they have to say. It might be the silliest thing in the world, but sometimes you just have to listen to yourself. Don't push it for too long. Only a few minutes.