Hello and welcome!
Unfortunately, there is much that doctors still don’t understand about Graves’ and its complications.
We have some good general resources in the announcements section of this forum. Try the “Treatment Options” and “Helpful Links” threads in particular.
For someone who is taking anti-thyroid drugs (methimazole, PTU, Tapazole), lowered white blood cell count can be a concern. But I’m not familiar with Graves’ itself causing issues like bronchitis. Hopefully, others will chime in here if they have had similar experiences…this could be an interesting area for further research!
Take care!