I have been lactose and fructose intolerant for as long as I can remember (3 or 4). No-one in my family has any digestive problems. I was fed with formula milk, whereas everyone else was breastfed.
If I drink even a small glass of milk I immediately bloat up, feel bad and vomit. I have never been able to eat an apple or pear. I have never liked processed jam, sweets, orange squash - but I can eat chocolate.
As a child I was often very tired and vomited quite regularly. I often had colds. I found sport made me extremely tired and I was often sick afterwards.
I have solved my IBS, but this is a remaining challenge. I have healed my gut (I had Candida) and I can even eat brussels sprouts, onions and peppers, which I never could before, so I don't think it's SIBO.
Would anyone have any similar experiences or ideas?