Facing hair fall. Easily coming out.

I am suffering hairfall from last 1year, 2weeks back done with blood test so my vitamin b12 is 151pg/mL(low) & vitamin d3 is 7.8 ng/mL (low) ☆For b12 using (methylcobalamin alpha lipoic acid and vitamins capsules) ☆for d3 using (60k capsule) {Maintaining diet, doing exercise, and there is no genetic issues,doing head stand nd balayam} Questions I want to ask 1.So want to know till when can I see the results from this supplements 2.Apart from this what I have to do to prevent hairloss. 3.Will it be reversible 4.past I consulted diagnostic he prescribed me minoxidil results are visible but there are side effects. So I  stopped using it. I want to treat it without any side effects. 5.i am using derma roller how many days I have to use it in a week and is it really helps to regrowth 6.using natural shampoo thrice a week is it ok. 7.when I am plucking my body hairs it's easily coming out. 8.i think it's telogen effluvium but want to know why exactly it's happening and how to stop it.