As-salamu alaykum,
While you I cannot diagnose you, it does sound as if you have generalized anxiety disorder. I would kindly suggest that you contact a counselor near you to get counseling. Counseling can get to the root of your issues which you have identified in part, as stemming from your family issues and your father’s illness. A counselor can teach you in depth coping skills and ways to manage your stress and anxiety as well as ways to increase your confidence all the way around. For now I would kindly suggest you try deep breathing exercises, progressive muscle relaxation as well as self-cognitive behavioral therapy. There are excellent resources on line to help you with this and I encourage you to seek them out insha’Allah. The deep breathing and progressive muscle relaxation will be of special benefit to your sleeping problems. Please do seek out counseling however to address these problems insha’Allah.
Your in our prayers, please let us know how you are doing.