i feel hopeless

hello all, i’m 17 years old and have been living with my bipolar diagnosis for about a year now. recently, my diagnosis was changad from bipolar 2 to bipolar 1 due to me experiencing psychosis. i forgot to take my medication last night and im feeling really down today. i feel like nobody cares about me and i feel hopeless, like ill never get better. i don’t want to live like this forever. i just want to be happy is all, and im scared for my future. is there anything that can help the blow? anything and all will help. thank you.