My head is always so dry and itchy in the winter. I have very thick coarse wavy long hair and I usually wash it every other day but lately my scalp has been so dry and itchy but my hair is greasy so I have to wash it everyday. I tried a good quality shampoo, head and shoulders and a purifying cleansing shampoo and nothing is helping. I scratch it all the time. There's a few flakes but my scalp looks clear so it's weird. Any advice? It's driving me nuts. Btw I'm 6 months PP and having lots of hairloss too not sure if that's relevant or not. Thanks