OP your in a very abusive relationship,your DH hasn't put you on the mortgage,he won't give you any money though he's far from poor,your not eating in the day so that you can feed everyone at night and you have no clothes that fit you and your scared of him and his reaction and he's hidden how much savings he has!
You need to get away from him and as soon as possible.
Please speak to the Womens Aid this is the link for them
www.womensaid.org.uk/?gclid=CJy2lf7p4s4CFeYp0wod2CoJAw
They're help is free and confidential,there's a part on that link where they show you how to cover your tracks online if your worried that he'll be able to see what you've been on.
Please contact someone from there as soon as you can,I've been intouch with them in the past to get help for a couple of women that I knew that were in abusive marriages and they were amazing helping me get the women and they're children away to safety.
One of the womens story was just like yours,she'd been with her husband for years and had 2 young children.He earned alot like your husband does and at one time she went without a cooker for over 2 weeks because he refused to buy another one after they're old cooker(they'd had it years)had broke down.He didn't care because every day he'd go out a have a nice meal for lunch(2-3 courses)and then he'd get himself another meal before he came home.
His wife and 2 sons were pretty much starving by the time they reached out to me for help and with Womens aid we got them away to safety.
She had no family or friends locally to help either.
When is he next at work?Whilst he's out of the house do you think you'd be able to find any paper work of his that has details of any savings accounts,bonds,shares anything like that,details about when the mortgage was taken out,how much for and how much has been paid off,any messages you have from him weather they're emails,texts,voice mails,notes he's wrote you where you've asked for money and he's refused or had a go at you anything like that get whatever you can together and make copies of it all.
Make sure you remember where you got each item from,take a copy of it and put the original back where you found it so he has no idea.
Make sure you hide whatever evidence you get together somewhere he won't find it.
Womens aid usually have good connections with the CAB so they should be able to help you find legal help through them as well.
I really really hope now that you've posted on here that you don't feel so alone OP and I so hope you get yourself and your baby away from this awful relationship and soon.
If I could pick you both up myself and help you get away I would!
I hope you keep posting on here OP to let us know how your getting on,what your going through and the way your being treated within your own home is not normal,you and your child both deserve so much more.x