The answer to your question is "yes." You can file a Motion to Modify Divorce Decree.
In any suit to modify a divorce decree the court will require the person who brings the suit to prove certain facts. If the moving party cannot do this, the court will order that the divorce decree not change. Suits asking to change various parts of the decree require the moving party to prove different elements, but all elements must be proved by credible evidence presented through witnesses and documents. For the most part, affidavits are not accepted by a court as evidence.
A suit to modify a prior order will require the Moving party to prove different elements depending on the part of the divorce decree he or she is trying to change. The elements a Moving party will be required to prove in the most frequently-sought modifications are listed below.
A motion to change the terms and conditions of visitation can occur within a Joint Managing Conservatorship or a Sole Managing Conservatorship. To win such a modification, the Moving party must prove the following:
1) the circumstances of one or both of the parents or the children have materially and substantially changed since the rendition of the prior order; or
2) the order or portion of the decree to be modified has become unworkable or inappropriate under existing circumstances.
A change in the terms and conditions of visitation will usually revise the schedule of time a child spends with each parent. In some unusual circumstances, however, such a modification could deal only with non-schedule issues such as requiring a parent's time with a child to be supervised.
Regarding child support, the moving party must only show that the circumstances of one or both of the parents or the child have materially and substantially changed since the prior order to change the amount of child support.
The above information comes from the following link to an article written by an attorney's office. I am NOT making a referral. The information contained in the article is very educational. The Moving party must only show that the circumstances of one or both of the parents or the child have materially and substantially changed since the prior order to change the amount of child support. http://www.familylitigation.com/Articles/Information-About-Modifying-Your-Divorce-Decree.shtml
In conclusion, given the facts that you posted, you may be able to get a modification of your divorce decree.
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***Answers given are for informational purposes only and are not meant to replace the advice or assistance of an attorney licensed to practice law in your state. If you need any more information, please do not hesitate to ask. Thank you!