Predicted 45 but burnt out and lost all motivation

I am a DP 2 M25 student that got predicted max points at the start of this year , which i think is unrealistic and I begged them to make it lower but I did really good in my end year exams. Although, since November I have had no motivation to study. I sit down and I barely learn, my brain does not work the same anymore I am struggling and my teachers have noticed although I keep on pushing and saying I am okay. I don't know what to do, I feel like I am wasting my potential although I don't know where it went. I am in a deep hole i don't remember anything from last year but I just cant make myself re-learn it, I feel burnout and disappointed that I put so much work in and now I am failing. My mocks are in a week and I haven't started studying anything. I really don't know what to do, I used to be so organised but now I barely attend school. I cant even sleep because of the stress for externals although I can't do anything due to it. My only thoughts are the exams and how I need to study but have no motivation. Any students that are going through the same thing or went pls help I really need it.