I've been on Singulair 10mg tablets for only 4 days to alleviate ...

I've been on Singulair 10mg tablets for only 4 days to alleviate seasonal allergies and have been suffering from very bad cramping in my feet, legs, hands, arms and upper body. Additionally I have experienced what feels like bloating and a hardening of the stomach area. On top of all this I've had the craziest dreams! The upside is my allergies have been relieved somewhat, but these side effects are certainly not worth this additional pain and anxiety I've been suffering. Further reading on Singulair, including this forum, Wikipedia, and other places has left me convinced that this is not a safe medication to be taking (look up churg-strauss syndrome for example) and I will be discontinuing it immediately. I'm quite angry that doctors are prescribing such a thing when a simple antihistamine would suffice. This also cost me €60 for a 28 day supply.