I used some sand/meat tricks on my embark.
Not sure what you mean?
The snow must make dwarfs lazy because it took two years for most (not all) of my wagon stuff to be moved out into my stockpiles.
Did your tricks mean things like bringing one of every meat, so that you have a hundred or more barrels, far more than you usually do? One good way to deal with this is to cave-in the wagon point and set the crash-landing as a stockpile. Practice safe channeling.
A little was my fault, I forgot to setup any plants to grow for the first 6 months after I made my plots. Even after that though, half the food would just die on the vine, despite properly setup stockpiles, I just couldn't get enough haulers.
I usually set three Dwarves to do nothing but haul food, and have one be the planter, one be the brewer, and one be the cook. They will have some down time, but if you're a Legendary maker of something so necessary, you can have as much downtime as you want.
I tried to setup hunting parties with my military, but no one would bring the corpses back to the butcher. I'd have to get rid of my normal dump, set it up in the bucher's stockpile, and then dump the corpse, and reclaim it.
Do you know that by default Dwarves ignore outside refuse? Hit 'o' then 'r' to toggle this.
Then no one would move the meat from the bucher to the kitchen!
If the butcher was outdoors and you left ignore outside refuse to default, people won't haul some things from it, but this sounds like a stockpile problem. The dead-simple troubleshoot for this problem is to remove all your stockpiles and problematic shops and recreate them.
Everything was frozen and I couldn't find any underground rivers, if anyone became bed ridden, they would die of thirst. Babies would die as well.
That is a problem with frozen biomes, but at least you save FPS with the reduced wildlife... and personally, I think most injured Dwarves aren't worth saving.
A good way to end anguished-mother tantrum spirals is to sequester her in a room and lock the door. If her body is never (never, never) found, no-one will get upset about her death, and the spiral will be contained.
I'm curious to know what exactly happened. Next time you try, let us know if it works out any better!