Buying a house and it floods everytime it was seller didnt tell me about it can i sue for damages are the money i have paid towards the house can i get it back

You can sue the seller, based on fraud (concealing material, or important, information he/she had about the house, which concealment was done to induce or cause you to buy the house and which did affect your decision to buy it) for the cost to repair or remediate the situation, if it can be remediated (e.g. by french drains, water proofing, additional sump pumps, etc.). If it can't be remediated or corrected, you may be able to rescind the sale (give house back, get back what you paid--though you'll then need to return any funds from a mortgage to the bank), though you'd have to pay (i.e. have a set off vs. whatever you get back) an amount equal to the fair market rent for the house for the length of time you lived there, since you did get the benefit of possession of it.

You can sue the seller for fraud.  Fraud is the intentional misrepresentation or nondisclosure of a material fact made with knowledge of its falsity and with the intent to induce your reliance upon which you justifiably relied to your detriment.
In other words, you would not have bought the house had you known of the flooding.
Your damages (monetary compensation you are seeking in your lawsuit for fraud) would be either the benefit of the bargain or your out of pocket loss.
Benefit of the bargain means a defrauded purchaser may recover the difference between the real and represented value of the property purchased regardless of the fact that the actual loss suffered might have been less.
Out of pocket determination for damages for fraudulent misrepresentation permits recovery of the difference between the price paid and the actual value of the property acquired.