Re: Just got married a few weeks weeks ago...
Don't allow this pattern of behaviour to continue.
Have a "breakdown", call in sick for a week (or arrange a week off work in advance). During this time have a breakdown. Say u r exhausted from everything, stay in bed and let them get on with it.
This in-laws family of yours survived perfectly well by making their own dinners and cleaning their own mess without u, it doesn't mean that u have to do everything they used to do. U need a BALANCE of responsibilities in your household, so tell them u cannot do it all and suggest ways in which MIL and Hubby can help u. Be very open about it.