Hi Serenity15, really sorry to hear you’re having a tough time. We have some specialist information about Child Maintenance on our website which might be usefulhttps://www.gingerbread.org.uk/find-information/money/child-maintenance/
If you would like to get some advice tailored to your circumstances, you could also contact our specialist advisers https://www.gingerbread.org.uk/talk-to-us/ I hope this helps you, and please do let us know how you’re doing.