Trust your gut feelings..?

Help me out here..

I'm in a relationship with this great guy. He's attentive, communicator(working on being better at it), and very loving. We've been together for some time and I adore him. But...

I have this consistent gut feeling that something just isn't "right". This feeling is keeping me from fully trusting him or feeling completely relaxed in the relationship. Could it be because of my anxiety disorder? How do I know when to trust my gut feeling and when to let it go?