It is really unfortunate to know your case history.
Do not worry, if you persevere then guilty can be punished.
1.Do visit a local police station and lodge a complaint against your husband and in laws in details about the tortures perpetrated upon you including the demand of dowry.
2.On the basis of your complaint , case u/s 498A, 406. 323, 506 IPC can be started.
3.Thereafter file case under PWDV Act claiming for maintenance and medical expenses. It will be granted.
After these cases of your husband realise his guilt, reforms himself and ask for your forgiveness, you can seriously think of reconciling with him again, at lest for the sake of the child.