What should you do? Well, for now you should focus on having your baby and then deal with these other issues after the birth.
I can say the situation doesn't sound promising, i.e. an unattentive husband, an ex wife who still wants him and is harrassing you, his family not accepting you, etc.
I see that you are living in the UK and I am not sure what country you are from, but you may need to go back if you can't independently establish yourself in the UK.
Have you talked with your husband at all about how you feel and about how he is treating you?
Hi, not to be rude but it appears from what you wrote the both of you have your own interests at heart. You mention you were promised loads of things that you have not recieved yet and he swooned you and now that he has you hes preoccupied with other things that he wants.
Granted we need things from a relationship but giving is better than receiving.
If he gives you all you need, including affection and you give him the things he needs, then both have the others interests at heart. I just dont see this happening from your post but is more taking and expecting.
Are you in a country where people go to get couples counseling? Or is it a more traditionalist place where women are seen and not heard? And where are you from? It sounds like both a culture clash and possibly that you are right that your husband married you for wrong reasons and is now indifferent or regretfui. If you do decide that is so, what will you do? Again this would depend on his culture -- can you go home to your family and take the baby, or would he fight you on that? Would you want to leave if it seemed hopeless or do you love him so much that you would stay even if you thought he was regretting the marriage? It's really hard to advise you without more information on where you came from and where you are now. For example if you are an American girl and now are living in India, you might not have a lot of choices in regard to your child if you decide to leave.