No, haven’t had that experience. However-
It sounds as if your scheduled IVIG is once per month. According to the NIH the ‘treatment’ for H. pylori usually takes 14 days with an 80-90% cure rate.
You should be able to finish the ‘cure’ between treatments, get retested, and then continue your IVIG.
Disclaimer- the article I’m referring to mentions peptic ulcers. I am not suggesting you have a peptic ulcer. I’m only talking about the “cure.”