Do a search of the ‘Net for: MSM allergies

You will get many leads to articles similar to the following…

http://www.natural-health-and-healing-4u.com/msm-powder.html
What Is MSM And How Do You Use It For Allergies?

https://www.nutriteam.com/msm-allergies
MSM and Allergies

There are books available on MSM. One I have read, and recommend, is:
The Miracle of MSM: The Natural Solution for Pain
by Stanley W. Jacob
This book also discusses using MSM for allergies.