Welcome!! I'm a Mama with a child who has SPD so hopefully some one with an adult perspective will pipe up for for what it's worth here's my two cents. It's summer now, do you have an access to a pool or beach? I wonder what spending some time in the deep water each day would do for your sleep and your sensitivity. Weighted blankets are a common recommendation, we didn't find it miraculous because it made her too hot and she needs to be cool to sleep, I think maybe instead of just going out and buying a blanket some thoughtful evaluation of what your sensory needs are at night might help. It took us a long time but I think we've finally found a good combination for my daughter, she needs a very soft mattress (we're actually using an air mattress) and blankets and pillows surrounding her sort of like a nest. She also needs a soft light versus having the room totally dark. For years we kept trying to make the room darker, but it turns out that was a mistake.

Also, how is your nutrition? Have you considered that you may have food sensitivities. A lot of people with SPD are helped by a casein free gluten free diet.