I am the husband and I have Sexual problem(Erectile Dysfunction).

I am the husband and I have Sexual problem(Erectile Dysfunction). I am 31 and she is 29. We are staying separately since July till date. I am earning 30,000 per month and I have no father and need to take care of my mom as well. I have no house or property too. Wife's family is asking for divorce and threatening they will put false Domestic Violence case. She is already working and getting more than 40,000 per month but still she is asking too much of Alimony and life time maintenance. Marriage is not yet 1 year (Date- May 9th 2015). I guess we can file for Divorce before 1 year as per Sec 14 in exceptional cases. They are always calling in phone and scolding with bad words to me and my mom. 1- What are the exceptional cases under which circumstances under which I can file for divorce before 1 year of marriage completion? 2- Does my case comes under Exceptional case and can I apply for divorce before 1 year? 3- How much Alimony should I give at maximum? I don't have much money. :( 4- How much is the cost for filing a divorce in court?