Priye Deepnil
I am a worshipper of Shivji. I have gone through your post and I am deepply saddened with what you are going through.
I can see no one have offered to give you a suggestion to your problems, because all it seems is that everyone is trying to to a mantra/jaap for their own benefits, well why wouldnt they?
But everybody should know, that if you want to achieve anything in life, you have to pray/jaap to the Paramathma without any self fulfilling wishes. And it will work.
I would suggest you to jaap Maa Durga's Aum Hring Kleeng Chamundae Vicche, on Fridays. Do this for 21 Fridays, and see the difference
Pray to her without any wish in your mind
Shiv Shambhu Bless you
Swamy Ji