If it is a metal building, I am assuming when you say clear height that is underneath where the rafter and column come together or are your saying that is the clear height everywhere on the inside? 

A good drywall finisher could have your ceiling patched from underneath in 1 day.

You can test it by placing a rolled up towel underneath it and manipulate the closing force accordingly.

The range of potential fixes could be from epoxy injecting the cracks, which would cost roughly a few thousand dollars, to soil or foundation stabilization, which could cost a few tens of thousands of dollars. 

Worst case, you would want to slope the soil a few feet from the foundation and maybe add a french drain.  

if you have no gutters or downspouts taking the roof water away from the foundation its going to puddle .. and of course depends on the soils etc.. 

It likely has gotten underneath the vinyl planks. 

When was the house originally constructed and in what type of soil (embankment or natural soil)?

You can get someone to come out and do this, if you find them you probably need to do soil testing.

@Nick Mace I have always taped a copy to the door and slid another copy underneath.