My daughter was diagnosed at age 4 with irritable bowel syndrme but we weren't told much aside from no acidic foods/drinks & that was it, until

she went to italy for a student exchange thereby changing her diet & lifestyle drastically & she lost weight, but

drs diagnosed her as having anorexia nervosa (after all female, 15 weight loss - what else could it be) no matter how much we suggested other possibilities, including ibs, parasitic infections (she'd been on farms) carbohydarte intolerance etc - no we were idiots & wrong, & we were imagining the huge amounts of food she was forcing down her throat every day.
They had her on food supplements (which made kids mum's throw up!!) & then complained that she was eating too much & they ewre going to restrict her food intake!! I removed her instantly & got her other treatment from a psychiatrist as by this time she was not only seriously ill due to eight loss she was also traumatised by the drs & I was afraid she would suicide!! (at 15) the new dr is wonderful, a real godsend, even typing this i'm almost crying with relief as she is now back to a healthy weight & although still traumatised by what was done to her last year, she searched the net & found ibs & the diet for it as well as recipes & she went on that & is getting better every second.
Drs do not listen to patients or to parnets or other family members trhey have god complexes & should be made to go through what they put their patients through & feel what they suffer & what their families suffer - the drs reported us to child welfare (thank god the new dr knows the others are morons - despite having a world class reputation).
My daughter at 15 is a f/t univresity(college) student with an sat1 verbal score of 96th precentile - scored while at her sickest!! But according to the drs that wasn't possible since the anorexia would seriously affect her academic ability - well that's fine I can only assume she's get 100 percentile now!!
Drs have to learn to listen & test before just deciding & closing their minds to any other altrnatives.