Singulair and ringing ears

After five days my hot flushes returned, ringing ears, strange morbid mood, but the big clincher was the MONSTER headaches like a 'high blood pressure head ache', would stretch in bed when moving especially around 4-5am and wham the headache would pound/bound. Headache would calm down if I got up and had coffee. After 4 days I started to get worried and stopped Singulair after 5th 10mg dose, and now two days later headache, jaw pain, pain in upper shoulder muscles and at C-7 spinal vertabrae are all gone and I'm not so over whelmed or dizzy.
What was good? I did not have to use my inhaler for those days, but this certainly is not a 'magic bullet' if you suffer with symptoms that are so dramatic and scary!
Do they prescribe too high a dose?, should it be every other day or once a week? Are they really certain about interaction with other medications and vitamins etc?
I do not think I will try it again, I felt like my headache was on the verge of a CVA!
From a Canadian who was given a prescription i now cannot use.......