I am assuming that by mx you mean Minoxidil. Minoxidil tends to increase hair fall in the first 4 weeks of use ..but this signifies that the action has started and the old dead hair are being thrown out and new hair are coming. My suggestion is that you continue treatment and simultaneously visit your dermatologist to get answers. Dandruff treatment usually doesn't aggravate the pathology behind hair fall is my experience.
Next Steps
Continue treatment and simultaneously visit your dermatologist . Don't lose confidence.
Health Tips
go through this article please to know the life cycle of hair : http://www.skinmatra.com/single-post/2016/11/10/Hair-Woes-10-Things-You-Should-Know-About-Hair