Feel like I'm going cross eyed?

I don't know why- but for the past few months I've been getting this feeling in my right eye like it's trying to shift to the right. Sometimes when I look iin the mirror I feel like you can ever so slightly see it's a little more to the right. I really don't want to be cross eyed. Please help! It kind of feels like pressure behind my eye too, but it's not sinuses. My right eye is my weaker eye. I had lazy eye when i was little. And i have sigh problems in it