Hi katymac
Ok, It really does not sound like anything to major has changed. E.g. if you moved house the new house might have damp!
Certaininly if he has got scarring or damage to the lungs he is really going to suffer.
I assume that things drop straight to his chest. I laughed when my doctor warned me about this and I literally went to bed one night and woke up with douple pnumonia the next morning.
It sounds like the infection is not being cleared up completly. Which means that every and every time he comes off a course of anitbiotics he will get worse again. Just as a point it has take me 5months to be fully clear of broncitus befor now!
few things I can recommend. Do you have a home nebuliser? You DH is clearly old enough to be trusted to use it responsibly. I simply could not manage with a chest infection without mine. That why he can have medication deilivered stright to his lungs. Just have to ware and mask and breath in a bit of steam every few hours.
Have the doctors ever given him prodisolone (sp) they would be little brown or red tablets he would take maybe 8 - 10 in the morning? These are steriods that help the lungs regenerate. Given how ill he has been his lungs need some help. Lots of GP will loan these out in the short term but you may well need to fight to get one. You can buy them too. but cheaper to borrow and see if it helps
Make sure that he sleeps with atleast two pillows his head should alwasy be above his cheast. (He will need pillows to help support his neck and get comfy) This will help clear the lungs of liquid.
Hot steamy baths of simply sitting in a hot steamy room, with help ease any mild tightness in his cheast and help break up the infection.
There are loads of non invasive things you can do to help like honey and hot lemon will help break the infection and easy any soreness.
If at any point he complains that he is really pain when he is coughing or holding his ribs to be able to cough. Go straight back to the docotors. as this can be a sign that the infection has got worse. Same if he coughs up any blood, or red phlem.
I have to say that 12 infections over 18months is terrible, kick up a stink and get his gp to get this sorted. He needs help. You need referal to a good specilist not an nurse a consultant. No disripect intented nurses are wonderful but he clearly need medical support.
Also his immue system is taking a hammering, and will need help to keep him fit infection in the future. So lots of vits and minerals,
As to things being related I am sure they are but that is for another post as I have already gone on far to long !! sorry
Hope I have been of some help