Well during the sneeze intraabdominal pressure is raised and if you have any organ enlargement it can cause pain. Usually it is liver, spleen
. Also stomach disorders such as hiatal hernia
can cause such symptoms. Dont be worried , this is nothing serious.It sounds to me like gynaecological story. You should just do lab tests and abdominal+pelvic ultrasound
to rule this out.
Wish you good health.