Weird head rush feeling

Not looking for medical advice just wondering has anyone else experienced this weird scary sensation? Comes on randomly or during an anxious moment. I describe it as a head rush. It’s like as if you stood up really quickly but it happens at rest so sitting, lying down and when standing or walking. When this happens it either feels like that, or a sinking sensation in my head and I feel kind of woozy after it it’s kinda like a mild faint and I also get a fright so I get an adrenaline type feeling in my chest or stomach. Sometimes I get a hot flash. I’ve had this sensation for so long I think maybe nearly 2 years or since the start of last year but I started getting it constantly maybe last autumn.

EDIT: I just realised my ears ring really loudly when this happens.