Severe hairfall for past 2 years. How should I treat this? Any inputs?

[RobertBBrown]

From 2 months of Minoxidil you will not see a result, you need to take it longer than that. Also in the beginning it will see a additional shedding when thinning follicles are pushed out in the progress of regrowing, so I'd continue using it.
Also when you supplement Vitamin D it shouldn't be the main reason, especially when it's so much.
Your age and family history would also be interesting to know, also if the hair loss is primarily in the hair line or all over the head (especially side and back of your head), if you lose it at the back and the sides, which are normally parts of your head where male balding is not that common.
You might want to add some DHT Blocker shampoo to your routine, Hair Surge is good with caffeine boosting grow of new hair or Hair Restoration Labs DHT Block shampoo.