Any side effects of long term IVIG treatment?

I am now 53 years old. I got diagnosed with Thymoma in Dec 2020. Had surgery in February 2021. After surgery, in April 2021 I started slurry speech and difficulty swallowing and after 2 visits to ER I got diagnosed with MG. It was MG crisis. I did not respond to mestinon nor prednisone. My neurologist started IVIG in July 2021 every 4 weeks for 2 days in a row, in addition to prednisone 20 mg. We then tapered it down until January 2022 I was off of prednisone and wanted to return to work as Radiology technologist. My workplace mandated the booster. I took the booster, went to work and 6 weeks after I had exacerbation of MG in March 2022. I am back on Prednisone and IVIG every 3 weeks for 2 days in a row. I am not sure how r u many years I will be on this treatment which I am benefiting from. It makes me feel tired for few days though.