Hello, bumpy bumping as just out of hospital and hoping you guys have sage advice.
First of all, low PF means something different to me than most I think - my "normal," ie, when I'm just on my preventer (symbicort) is 550 (I'm a singer/ flautist, which helps)
I took a tiny cold on New Years Day, was on steroids by 3rd Jan and then went back to work a few days later. For that time was on 40mg pred, singulair, symbicort and salbuatmol.
PF not yet back to normal, then got caught in the rain there on Friday morning, had to go to GP for rescue nebs, they didn't work, so back on steroids, and a few hours later off to casualty (in the stupid snow) for investigations and more nebs.
O2 never below 94, but resps at 33 for several hours, and an awful cough with bronchospasm. Moderate infection in bloods, nothing in particular on xray.
Admitted last night for more nebs and anti-bs, then home this afternoon on the strict understanding that I farm the kids out and don't do anything. Steroids for 2 weeks, but reducing dose (after I got a bit upset, I Do Not Sleep while on pred, and I'm convinced that it hinders healing.)
I am normally completely fine, it is seriously only when I get the cold that I get difficulties, but they are talking about referring me to "difficult asthma" clinic, I guess because once it starts it is tricky to resolve.
Anyway, on sofa now, no realistic prospect of sleep after approx 2 hours last night, Pf good at 400, cough only when I move/ talk etc.
Any advice? I haven't been this bad in a long while, been so careful with diet/ exercise/ not smoking/ no triggers etc, but had a terrible stressful drunken unhealthy Xmas, and I think that's why I got the cold. 
Only 3 months into my new job, terribly worried about that.
TIA for any handholding!