Bone marrow modulates the immune system. Bone Marrow Strengthening and Enhancement can help normalise the immune system for some people.
Sapien hasn’t created an audio to stop the immune system from reactions yet. Dream wrote in a comment a while ago that he hadn’t yet figured out a way to create a field which stops autoimmune reactions without suppressing the immune system. I think creating a field to stop immune reactions in allergies may be a bit similar.
It’s possible The Flow of Jing and The Chi Elixir might also help as they strengthen bone marrow and compress chi into bone marrow, respectively.
Some anti-inflammatory fields from this post in another thread might help with allergy symptoms, tiredness and brain fog as well.