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From my personal journey - I've changed pretty much just about everything, including moving countries (not that has anything to do with it!). I've stopped smoking, eating far more healthy than ever before, limited my alcohol intake and started weight training and exercising.
Now I'm not preaching, I'm not saying that will work for everyone but what I can attest to is that it's allll helped on my journey. My achalasia is far more manageable.
Stress is a major trigger for spasms, so even though we can never totally live a stress free life, I do tend to avoid stressful situations. I also get anxious when I'm flying, which doesn't help and usually I'll get spasms when I'm sat in my seat with the seatbelt on!