unofficially diagnose what i’m going through

i’m not sure what it is, but once a month or so i’ll wake up in a hot sweat and a sense of impending doom . it’s like i’m thinking of an impossible task to do, for example one time it was building 3 million legos, and the mere idea/concept gets me anxious and nervous, and it causes an awful feeling in my stomach like nausea or about to throw up. . but, i’m in complete control of my thoughts and i’m aware what is happening. usually what calms me down is using the restroom and scrolling tik tok or something, and falling back to sleep . but im curious as to what it is , some sort of night terror ?