I stole an iPhone that was given to me by someone i love the most in the world.

I have an awesome brother, we’ve had our good and bad times before. I was no where near Iphone 13 user, i could never afford one. But he gifted me his old Iphone 13 pro before he upgraded Iphone 14 pro max. We been very close and I was so touched. This was my brother who always looked out for me in good times and bad. He was an absolute angel. But I felt guilty, I mean I took his phone without his permission without even telling him, I stole it from him. I took it more than a year ago and he was okay with it, he still uses me. No, it’s not just cause I feel guilty, I never slept for a single night properly. I feel like I’m going to be arrested by police any point of time or my brother is going to kill me. I have this feeling for more than an year now. I never meet him in the eye, i can’t even have a normal conversation, i just want everything to be okay and he is more concerned about me, he knows something is off but I just can’t tell him. I have anxiety, severe anxiety to this extent, I can’t even sleep. I was so busy with my college exams and stuff but this feeling only has grown stronger and stronger. I feel like I’m in a mental asylum, i just want everything to be okay, I am seriously thinking of running away, no I’m not kidding. I feel like I’m going insane.