My 8 year old daughter is experiencing pain & difficulty urinating & defecating. it doesn't seem to be a uti, and lactulose only helps for a few days ?

Long term issue: If this is a long term issue, it developed over time.Recovery may take a year or more under the supervision of someone knowledgeable in the problem.I suggest you find a developmental pediatrician or pedi GI with a team that works with this problem. Recovery often requires talk therapy,daily miralax or lactulose for a year,scheduled emptying plans, etc.It can be fixed, but it takes work.