I am having GI issues too. My origional does of lamotrigine was 100mg twice daily IR. In jaunary my neurologist began reducing the dose because I was having constipation. He said it was not an adverse effect but I did research and all AEDs can cause this. Now I am on lamotrigine 100mg ER daily. My constipation has improved. I have had to alter my diet. I am still working on this. I take Metamucil docusate. I like diet soda but my GI symptoms get worse so I am drinking green tea and lemon ginger tea. You seem to have a very tough situation and I am so sorry. I have ptsd. I have had life issues with anxiety and depression linked to unresolved trauma that I needed to adress. I had a craniotomy in May 2014 to remove abcess left temporal lobe from bacterial meningitis of my brain. I take also escitalopram 5mg and melatonin 10mg for sleep. I do not like polypharmacy in any form. I hope your situation with your daughter improves.