okcomputercrazy,

I am exactly there with you. I've been with mine about 2.5 years, and after about a year or so I began to be plagued with anxiety about the relationship. I worry that we wont work out, I wont be happy, he wont be happy, we wont love each other in a few years, he doesn't love me enough now, we're not right for each other, etc. It's SO hard to decipher whether it's reality (your gut telling you something is wrong) or just your brain.

I am still struggling a lot with this, but what's helping is to try to identify triggers and notice what my immediate reactions/thoughts/feelings are, and challenge those thoughts (CBT style). Also meditation. Also, when I notice I'm feeling insecure and clingy I try to leave the room.

Don't know if this helps you at all, but just know you're not alone.