You need to file a Petition for Modification of Custody, so that you can modify the visitation schedule to suit your present needs, given that so many things have changed since your initial order was issued. In order to move forward it will be easiest if you have the father's cooperation. You will need to serve him with papers, and get some updated information from him so that you can make sure you are receiving the proper amount of child support. His income has likely changed in the past 11 years, and so you will want to make sure you are receiving the proper amount of child support under the current laws. A good first step is to speak to an attorney in a confidential consultation, so that you and the attorney can form a game plan for you and discuss the costs to get everything implemented. Many attorneys will even offer you a free consultation.
Please note that this is a general posting, and you should contact a lawyer if you want specific legal advice to best suit your needs.