Veramyst symptoms and conditions

While I am sure that Singulair has adverse effects for some children/teenagers/adults, I took Singulair for 2-3 years (until my asthma symptoms improved to the point where I didn't need to take it) while I was a kid and had no adverse side effects. Started back on Singulair in April after having severe reactions to my new puppy (I am now 21). Since then, I really haven't had any side effects at all. I agree that they should black box Singulair and possibly not prescribe it to some children/teens, but for some people (like myself), it works, and shouldn't be taken off the market completely.

I have been taking Singulair with Flonase for one week (as treatment for chronic sinusitis) and two nights ago I was at a concert and experienced spots entering my vision from both sides until I was completely unable to see, though my friend told me my eyes were open. Then my legs went to jelly. My friends tried to help me sit down but I couldn't balance myself. I fell down and was out cold for about 5 seconds while my friends panicked and tried to get help, but I woke up right away and was ok after that. I have never blacked out or fainted before in my life though. I've also been experiencing anxiety and mood swings in the last week which are very unusual for me.