Well hey!
Hope you are doing good.
Just read about your complaints and here's what I can explain and which can benefit you:
Dandruff increases more during winters (so do not panic)
Next Steps
Use Shampoo Ketoconazole + Zinc pyrithione twice a week
Apply on wet hair and keep it for about 5 minutes and then wash off your hair
Apply it deep onto the scalp and NoT just the hair
Health Tips
Do not apply oil frequently
Change your pillow covers quite often
Do not wash your hair with very hot water
Try not using any kind of conditioners
Stick to one shampoo which I mentioned and use it continuously for 6 months