For around 4 years now i have experienced every few months what starts as feeling very hot and sick which is followed by intense lower back pain that makes it impossible to sleep it also radiates around to stomach and is hard to pinpoint the exact pain. I take pain killers that dont work unless i take it immiedatly when i feel it coming on but this doesnt always work, a hot bath usually helps but only a little bit. I also vomit until im retching and nothing else to come out. The lengh of each attack usually lasts from 4 to 8 hours usually during the night or early morning and am extremely run down the next couple of days and have no appetite or energy. I have had endocospoly, blood tests, x rays such as barium and urine tests, i have been diagnosed with gilberts syndrome which is evalted bilrubin i dont drink any achahol and eat very healthy i only drink water. Other suggestions i have been told are abdominal migraines, and ibs. I am desperate for an answer to this please if anyone has experience or advice. It is very hard to live with this and having no diagnose is extremely difficult to accept. 2014 i had 3 attacks once around march the next in july and the next in november, i am dreading the next attack.