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Riding through the Cali desert in the middle of the night in a skinsuit with the temp near 0 degC. Other than that, not really. Stress, new office perhaps a factor but seems unlikely - it's not like I'm down a mine. My GPs are generally idiots. I never see the same one twice and I typically use them to send me to someone who knows what they're doing rather than their opinion. I had to set up the electronic flow tester for her, for example.
FWIW my asthma was controlled by salbutamol from mid twenties to early fifties - I appear to have grown out of it, which coincides with retirement and reduced exposure to students and an inadequately cleaned workshop environment. Got any new potential triggers in your life recently?
As a separate issue, my GP will only prescribe Ventolin, not generic salbutamol - he claims that although the ingredients and dosage are the same, the particle size is smaller, making it more effective.