Should I soak freeze dried blood worms before feeding?

New to fish keeping. My betta refuses to eat pellet foods. I've been feeding him mosquito larvae that's been boiled or treated with methylene blue, and black worms that I bought and plan to culture in a container. I'll probably also buy daphnia/moina some time soon.

I fed her freeze dried blood worms and she swims a bit weird for some 3-5 minutes after eating it. She swims slow and it looks like she struggles to turn her body. She goes deeper into water and when pauses flapping her fins for a second, her body starts to lift from the back, is it some buoyancy issue maybe? Will soaking solve that?