At some appropriate moment tomorrow op, if you can bear it, and your dh isn’t completely irresponsible, just hand over your toddler to your husband without saying a word, and walk out of the door with a bag.
Once far enough away, turn off your location setting in your phone. Text that you are fine and will return on Monday morning and when you do, you need to have a serious talk. Stay in a local travel lodge type place or with a family member and eat and sleep for the entire weekend.
Go back on Monday and negotiate. If he protests and days he’s tired or he felt alone and couldn’t cope, tell him that is how you have felt for the last two years.
Changes might involve:
-putting your child in daycare for one extra day on one of your days off so you can rest
-your husband stepping up and doing all bedtimes
-your husband looking after your toddler on one of your days off
-your dh getting your toddler up and taking him to nursery in the mornings
- throwing money at it and getting a babysitter for Saturday afternoons or Sundays.
Tell your dh that this is non-negotiable because you are sleep deprived and on the point of a breakdown. Tell him that he needs to step up. Or get him to accompany you to a hv or gp appointment and get them to tell him to step up.
Tell him that if you do mornings, he has to do evenings or vice versa, like every other couple, and you cannot continue doing all of this alone. Do all of this very calmly and seriously and do not apologise or allow him to wriggle out of his commitments.
If he says he can’t do his part for any reason then calmly walk out again and tell him you are going to consult a solicitor.