Clean environment symptoms and conditions

I am a 60 year old man who has had allergies and asthma as long as I can remember. I've tried most of the medicines out there at one time or another. I hate the side effects of most asthma meds (especially broncodilator inhalers) and have learned to avoid them and manage my symptoms more through lifestyle (diet, exercise, clean environment) than drugs. I decided to try Singulair starting about 3 months ago to see if it would help with the mild night time chest tightness I would often still experience. I have to say its the best asthma med I've ever taken. I am about 90% free of asthma symptoms, and can sleep through the night without ever waking up with constricted bronchia. I don't use inhalers at all any more. Occasionally (2-3 times a week) I'll take a Claritin if I start to feel allergic symptoms breaking through. The only side effect I've noticed from the Singulair - and I noticed this from day one - is extremely vivid dreams. Luckily, I kind of like this side effect so I'm OK continuing with the Singulair. Also luckily, I've never experienced the aches and pains, weight gain, or other symptoms descibed by others on this site. The one thing I worry about is that this drug may be hard on the liver, as the liver metabolizes it. But since I don't have any symptoms of liver problems, I guess I won't worry too much.

Update to my June 20th post.
I have mild asthma but got prescribed the evil Advair by my doc a couple of years back. Recently my asthma felt like it was the worst it's ever been. Like other people have mentioned I felt tired, rundown and anxious. If I didn't take the advair every few hours my chest became tight and I'd start the usual asthmatic downwards spiral of panic.
I stopped the advair 8 days ago, my chest was tight at first but is easing up. I've had the rescue inhaler at hand but have not had to use it yet. I bought 'Reversing Asthma' by Richard Firshein and a Microlife Peak Flow meter to monitor my progress. My peak flow dips a little at night and first thing in the morning but I'm still well above average. Interestingly the tighteness doesn't affect the peak flow that much, which is great ammunition for calming yourself down when it feels uncomfortable.
Like Spunky said below, it's hard to trust some Docs, and the pharmaceutical companies are going to be as crooked as oil and other big business. They're eager to treat the symptoms for a quick fix rather than find the underlying causes, And a good diet, vitamins supplements, a clean environment and an exercise program isn't going to keep them in the lifestyle they're accustomed to.