Tracy,
Sorry to hear you're feeling so rough.I have not been on here as much as before but I am amazed at the difference in your posts.I was wondering if it was the same Tracy as before!
You may not realise but it seems by your posts that you have had some improvements(well deserved too)
before your posts were short and you sounded like you were
giving up hope at times.(I hope you don't mind me writing this)

As for what you are going through, sounds like all the reasons you suggest could be effecting you the medication withdrawel,the hayfever and the paint.
I hope you are over the worst of it.
Someone suggested to me for protection against allergies/pollutants/hayfever to take a combination of
Vitamin B5 around 500mg a day),vitamin C (to bowel tolerance)and paracetamol.
I took it all (except the paracetamol)and I think it helped,however hard to know as I'm taking so many remedies and supplements! aagghh

The paracetamol was for anti inflamatory purposes so instead I use tumeric and ginger in my food,like in salads and soups.
These are naturally anti inflamatory.
Try and avoid using regular paint,you know it's full of awful toxic stuff such as mercury ,lead?the fumes are hurtful even after it has dried.
There are lovely natural paints,I used one called "Auro"
I think it's from UK.