hi i came across this site through sheer desperation to find out if all the terrible symptoms my 13 yr old daughter was experiencing was through any of her asthma/allergy meds She has been on singulair since she was 5yrsold . But gradually over the past year her symptoms are that bad that she has weeks off school with dreadful headaches, stomach pains, mood swings which have been going on for last few years but put most of these down to puberty kicking in (but how i think i was so wrong). she has an allergy to peanuts which has been confirmed through tests but i was finding that lots of different foods were causing allergic reations which i could not understand(put it down to e numbers etc) she has been off this last week through yet again more headaches,chest infection, nausea but now the most terrible symptom is that of very painful ankles. knees, which are that sore she has been in tears.Since reading these post i am going to take her off the singulair but will do it at a gradual rate 1/2 tablet then 1/4 etc as she has been on this for a very long time and sudden withdrawal seems to be very risky. oh i also forget her rhinitis is also a major problem which causes her to be terribly bullied at school due to how noisy her breathing is and her snuffling being so often and seems to be getting worse. I am very grateful that i have come across this website.