Massallah pertaining to haiz

As-Salaamualikum Mufti, On the second day of fasting I got my Haiz after two months, this continued for 10 days and then it stopped I made my ghusul, on the 11th and 12 th day I was clean and continued with my roza and salaah.This morning I noticed some brown discharge, the rest of the day I was clean, I continued fasting but did not make my salaah as I am confused.
a) Is this part of Haiz? or does it fall as nifaas.
b) Do I keep gadhaa of this roza and can I continue with fasting if this happens.
c) Am I allowed to make my salaah in this state as well.
Please advice.
Jazakallah.