hi i had gone through your query and understand your concerns. i would come up with two most possibilities to fit your condition .these include
1.first possibility is,BENIGN POSITIONAL VERTIGO; it may follow a head injury
or there may be no evident cause.
can be elicited by the postural tests may confirm the diagnosis.
2.second possibility is,MIGRAINE;
possible causes include;
-may be hereditary
-may be result of liver
-may be unable handle stress
I hope this is helpful for you, thank you