Hi Beth,
tinanortheast is right. You need to do what is best for your family. There is an organisation called The Icarus Trust who provide support for families suffering with addiction, they may be able to help you in one form or another. It is a free service, so is always worth a shot. You can email them on info@icarustrust.org or have a look at their website http://www.icarustrust.org.
Good luck!