My 1 year old baby was feeling perfectly fine (no fever happy) when she suddenly started having episodes of crying with grunting and what looked like struggling to breathe. She had 3 of these episodes and then suddenly closed her eyes and went all floppy and closed her eyes 
I shouted and she opened her eyes and continued crying. We called for an ambulance, they blue lighted her to the hospital and she then had some more episodes at the hospital. They saw clearly that something is going on but could not find a problem. She had bloods checked, urine and chest x-ray but all was clear. We were kept in overnight under observation but were then discharged
Since a baby she has been having trouble with stomach pain, constipation (not now) and I have even thought a few times that she might have swallowed something. Could there be something that might be bothering her?
Has anyone had such experiences with an allergy, she is a very sensitive child but no know allergies (we only use specific washing powder, as a baby she couldn't tolerate shampoo so we got some from the doc, first 3 times eating banana she had a rash all over her body)
If anyone has had such experiences I would love to hear.