Brain fog has everything to do with the meds. It’s a chemical thing. Plants always help even just to make you feel better looking at and talking to them. :)

When you go in to hospital you can not have flowers when I asked why they say it takes your oxygen levels down that's the hospital view my foggy brain is to with not enough sugar in your body so that mean it could be to do with meditation diabetes or not eating properly x

Here is a site to check-out on best oxygen plants for inside. There are many other lists online. There is even one somewhere about what they want on the ISS. I have plants 2,3,4,5,6,7 in my house from this list. (My house looks like one big plant room/solarium/green house.) T😀hey don't list is the philodendron. It is on some of the other lists. What's nice about it, it is very hard to kill, and you get shoots for additional plants all the time. Read the plant directions.
https://www.terrycralle.com/best-plants-for-bed...

Last year we did have to install a new AC Heating system that came with a UV to destroy any mold, viruses, etc. Don't know if it really works or not but they are coming next week to do the routine maintenance.
It's a Champion heat pump, not sure I made the right decision but so far so good.

Snake plant or mother in laws tongue is a great purifying and oxygenating plant and is recommended for having it in the bedroom.
I've recently increased the plants around my house ( much to my cats disgust) has it reduced my fatigue dont know, as I'm trying to pace myself more, but I do feel calm and more at peace,give it a go, there's nothing to lose. 😁