It sounds like there are things going on that you know nothing about.
You should retain an attorney in order to get some orders in place. My primary suggestion is for you to get a therapist involved. That will get a neutral expert in place to let you know of what is going on.
You also need regular contact with the child. If that is per a Court order, then a contempt motion would be appropriate otherwise a motion to modify. You should also be recieving the child for visitation, at minimum, for the summer. These are the kinds of things counsel can help you with.
Best of luck.
I agree that you should consult with an attorney. Do you have a custody agreement currently? If not, you should seek one immediately. You are entitled to know about your child. Many attorneys offer a free consultation.