Side Roll and Startle Reflex

Autumn

My baby is 3 months old. She can roll to her side from her back now but not all the way over. I am still swaddling her at night because if I don’t, she scares herself constantly with her terrible startle reflex and won’t sleep and cries. Her arms flail all over, she scratched her face to pieces, grunts, and throws a fit if she isn’t swaddled. I don’t know what to do with her. She’s a bad sleeper as it is due to severe gas and stomach issues.