Facebook/System information and account hacking?

[Sohaib]

Help required- my FB acount is not secured

Hi Mates,
i am facing a swear problem with Facebook. and is very depressed. Someone has put me in tension and i am feeling total unsafe in the world of Facebook.

before we go to issue, i would like to describe situation. please read patiently. i ll be thankful.

1-
i have one (say A) main/personal facebook account and two (say B & C) visiting Facebook accounts.
A has no link with B and C, neither in terms of Name, nether in terms of ID, neither in terms of behavior. But only one similarity that A & B,C have same phone number but that number is hidden and available to public and even friends.

2-
Email-ID and phone number are hidden in all three accounts

3
i access all three accounts from one system but different browsers. and that system is secured and no other person can access that. this is for sure.

4
i know about fake pages and fake links. so i have never gave any password on a page opened by a link. i always open FB by URL.

5
A has no link/similarity with B and C (except number which is hidden). even name is different. totally different. even different friends, different page, different groups.

6
B and are fake accounts. so no one from B and C knows the real identity of mine in those accounts.

Now we come to the point

someone kept an eye on my IP (I believe) and he/she messaged me on account A from his newly made fake account that

7
you are the person who owns fake B and C accounts. and i was astonished and depressed at his discovery. because only I know about B and C accounts. How can he knows that I own B and C accounts ???

8
He even knows about my email ids of all accounts and phone numbers associated to each account , …….. by the way, email-ids and phone are not public. And are available to me only

9
I am in mental torture by this action of un safety. I believe that my privacy has been destroyed. I don’t want that anyone able to knows about my activities about my fb accounts. Hacker is using these information for blackmailing against me.

10
Now I want help from you guys please regarding:
10-A: how is it possible that he knows such a complete and 100% details about my all accounts ? and how he knows that fake accounts are belong to A ??? is this IP tracking or system tracking or something else ?

10-B: what is the solution ? how can I prevent my system and accounts to avoid hacking attacks ??i want security. Fool proof security. I have listened that some tools are available ,, like IP lock etc which restrict hacker to hack accounts.

10-C: how can I know about the person who hacked my information ??? I want to trace him out. His talk shows that he knows me very well and his is very close to me. (please note, consider point#3. No person can access my laptop)

Can someone please help me in finding the answers of above THREE Questions ??? please help

Thanks for your kind help and interest.
Regards,