Contradictions have come out as far as i have read. First you wrote your parents live in rented accomodation and then you wrote, that you have no house to live in (now parents house is not consider mine).
That means either your parents has a house or not. First decide that. As per the Hindu Succession act, 2005 you have equal right in your parents house as your brother has. Moreover, if your parents were/are living in rented accomodation how can they spend 40 lakhs on marriage (when a house can be bought in 40 lakhs). I doubt. Anyways, you have to prove this in court of law that expenditure was of 40 lakhs. Even if you prove that, then marriage expenses are not returned to you as per the law.
You have asked straighaway question on money, that is the reason learned members here have taken this post as extortion of money from husband which is the modus operandi in most of the matrimonial cases these days.
If you are educated and capable to earn, i feel you want to be a burden on everyone. I would advise you to stand for yourself and start earning. It would help you in longer run. Rest decision is yours, as we can only advise.
Moreover, if you want to remarry after alimony. then alimony is for maintenance and for lifetime. Dont use such statement of remarrying in court as it may go against you that you married only for money.
Your kid will be your responsibility once you remarry cos if your 2nd husband does not adopts the kid legally, then you have to bear the kids responsibility. For one time alimony you can prey to the court, it's judge discretion how much amount he decides only if you win the case. If cruelty is not proved, no alimony no divorce will be granted.