I am having the worse time with my husband and mother in law?

I feel like she is competing with me. Like she is not willing to share her baby boy with another woman. She is at my house all day long every day. I mean we are talking until 1 or two in the morning sometimes. She has done a lot to help us out lately and I have already told her how much I appreciate what she has done but she continues on and on about everything she has done. Even making statements like " Oh I can go home, I'm not doing anything here but spending my time and money." Well she forgets that I have loaned her plenty of money in the past, but I don't constantly nag her about things myself and my husband have done for her. And my dad literally gave her a car. I mean Gave it to her for free because she didn't have a vehicle. Plus not only is she over here all the time (besides to sleep) she has told my husband that I didn't tell her thank you for her help in planning our wedding (which by the way she took total control of) which was a bold face lie, she comes over here and nags on me about my housekeeping skills, tries to tell me how to raise my children AND what makes me the angriest is if my husband and I are in an argument she can't stand it if she's not right in the middle adding fuel to the fire. She actually told us yesterday that our marriage was never going to work with out counseling. Ok he and I have has our share of disagreements, but what couple doesn't. But ever since the wedding she won't give us anytime together and our arguments have gotten much worse. I already talked to him about my feelings. He didn't talk to her about it or stand up for me. Instead he called her and next thing I know she is banging on my front door demanding me to come outside so we can talk. So I have confronted her as well but things still haven't changed. In fact it got so bad that last night he and I had an argument over a freaking can of tuna fish that I fed my dog. He stormed out the door and at 10:30 at night my MIL is walking in my door (because she doesn't seem to think she has to knock) and telling me that Mark is distraught and she thinks it best that he and I spend time apart. Then he gets in her car and leaves!!!!!! I am so sick of her ****. And I am so tired of him being such a freaking mamma's boy and running off to her so she can kiss his boo boos. She won't let him go, it is going to ruin our marriage, and he won't see my point of view. I'm dealing with another woman, and its his MOTHER!!!