I'm sorry it was so hard yesterday, how has today been?
GW should be a really gentle approach, I'm sorry yesterday was so upsetting for you and your DS
Could you describe how you're doing GW from start of wind down onwards? I sleep trained my DS with GW and it worked really well but we took tiny steps at a time.
In the very first stages I would hold him until almost asleep, put in the cot and hold him in cot until asleep.
After a couple of days I put him in cot a little sooner and stopped holding when he was almost but not quite asleep.
Then gradually with putting him in cot a little sooner and letting go a little earlier, got to put him in cot relaxed but awake and just having my hand next to him.
Then standing next to cot
Standing behind cot
Standing at door
Standing outside door
As you can guess it was a slow process and took a few weeks to take all those steps...but was really effective for us and he has self settled for naps and nights ever since.
Have you read the GW part of this link?
Toddlers: Walk In/Walk Out vs. The Gradual Withdrawal Method (HOW TO CHOOSE)