Hey nervous SLF
In 1990 several of us heard a noise from the top of the cabin of a BA 747 as it taxied at San Francisco airport.
To ease your state of mind: there aren't many things that will bring down a jet after take-off, certainly not things that make rumbling noises behind ceiling panels.
What will bring down a jet are flaps, trim or lack of flightcontrols. These are often referred to as "killer items".
I understand your anxiety about the noises you but you shouldn't worry about them.
What will kill you is a wrong setting of flaps or stabilizer (which was hit by the Ryanair), hence the discussion here.