Well honestly that could be worsening things massively, mine was really bad after the immunotherapy treatment, I had to retreat to my bedroom for nearly 6months until I could get the house cleaned up with someone dusting, hoovering and the use of air filters on high power, it took ages but it worked, how possible is that for you? fabric sofas are a big source of dust for me, loose covers or leather are best.
Its so hard investigating your environment and keeping it free of dust when you feel so ill. And as for carpets - don't get me started on those
I put throws over mine for my dog to lie on and then wash the throws, this illness can make us seem paranoid, don't call Wessley please......
Do try the Qlink - I did and hope it works for you, but make sure you can return if it doesn't suit I just felt really ill from the first time I put it on, no problems with returning it though and money back straight away. We're all so different in how we react to things.
Re antihistamines, I tried a new one recently just half a pill and think it did help its called Zirtek -recommended by someone on PR as an anti-inflammatory, think Piriteeze is the same compound but cheaper, maybe worth a try? I only took it for 3 weeks but it seemed to get me over the worse.
You're right about needing extra minerals, I tried the Nutrimins last year and like a fool went on to have a good 8months and stopped taking them. Just started again last week they seem to suit me fine.