Mate this is exactly the kind of report we need more details on. What time was it roughly, and did it make any sound at all? The sound thing is massive for me - I've been out near the Broads twice in the last year watching stuff that seemed to hover and both times there was this really low almost subsonic hum that you felt more than heard.
Also what was the light situation like, was it emitting its own light or were you seeing it against the sky? Cornfields in Norfolk specifically have a weird history with this stuff and I don't think its a coincidence that we get a lot of reports from agricultural areas.
The fact you can't stop thinking about it is actually significant imo, a lot of witnesses describe that same obsessive recall quality after close proximity events. Don't dismiss that feeling. Would love to hear the full breakdown when you're ready to write it up properly.