I'm a 38 year old male who has had asthma, allergies, and bronchi...

I'm a 38 year old male who has had asthma, allergies, and bronchitis ever since I was a small child. I've tried many different medicines and steroids over the past decades to try an control my asthma. I recently was introduced to Singulair by my doctor, and in the first 2 weeks I had no symptoms and my asthma was miraculously controlled. However, after those first initial 2 weeks I started showing some serious symptoms; nausea, joint stiffness, dizziness, lack of energy, dehydration. But the worst side effect is the MIGRAINES! I used to suffer from migraines in the past (about 4 per year that would each last about 2-3 days max.). Now I have had a migraine for the past 10 days, and if you've ever had a migraine before then you would know how crippling it is. I was waking in the night because the headaches were so bad. I put this solely on the Singulair because I am not taking any other medication except Ventolin (which I have used since I was 5), and I've juggled my diet trying to see if it was a food reaction but it wasn't. I have stopped taking the Singulair for 3 days and counting, but I still have my migraine, I know it takes some time to get it out of my system. Originally I was excited to see the Singulair working but now I can't wait until its gone, its made my life hell. I will go back on to SYMBICORT because it did help manage my asthma, and most importantly; it didn't suffer any side effects from it.