So can you sue if an ex spouse now boyfriend comes to your job 90 miles away from anything he normally is around on her command during a custody batt

The facts are pretty unclear, and it is not even clear who was or is paying what to whom (child support? alimony? other?) or who is where (a Nevada decree?  the parties are all still in Nevada?  other?)  Time is not your friend -- generally modifications are not retroactive, so you should act quickly, but loss of a good-paying job is probably a "change of cirumstances" for modification of exsting orders.  You should consult a family law specialist as soon as possible. If you really cannot afford counsel, the local Pro Bono provider is the Legal Aid Center of Southern Nevada, which can be called at 702-386-1070 (or see their information on the web at http://www.lacsn.org/option,com_jcalpro/Itemid,3/extmode,view/extid,15/).  Those that take pro bono cases take them after they have been screened, and assigned, by Legal Aid.  The Reduced Fee Panel sponsored by the State Bar can be reached at 702-382-2200.  Additionally, there are free consultations offered on Thursdays at the self-help center; volunteer attorneys provide 15-minute consultations, for free, on family law questions.  For those that wish to attempt self-representation, forms are available at the Clark County self-help center website, at http://www.familylawselfhelpcenter.org/.