h f d
I have two friends who've had the bore out - it's been a year since for the first guy and no recurrence... the other chap was a bit more recent but he's doin' fine so far.
I have had a serious bout of sinusitis which cost me a few sick days some time ago an' what I do fairly regularly now is hit the sauna at my fitness centre where there is a pleasant concentration of menthol or eucalyptus which stimulates the sinus and bronchi... I view this, personally, as a kind of preventative measure and it seems ta be workin' well for me.
I suspect yer in the UK? Years ago whilst working with the RAF I had a bad cold and got given a thing I 'member was called karvol - it was a little brown gelatine capsule containin' a strong concentration of menthol (I think). The Doc told me ta put it in a pan of very hot water, put a towel over ma head and inhale deeply and often for 10 minutes or so... it does wonders for the sinus and you don' have ta go to the gym and git yer trunks on for a sauna, ya' kin do it in the privacy of yer home.
Another good preventative solution is the ol' standy Otrivin... coupla squirts before a sortie in each nostril and it really cuts down on the sinus distraction and helps valsalva be more effective... I keep one in ma briefcase these days, just in case...
Good luck, 'n keep the shiny side up!
k-o-t-s