Your description is typical of vertigo
. The most important reason is the ear. The ear has 3 parts - the inner ear
has the balancing mechanism. Any insult - say a viral infection - causes such symptoms.
A low blood pressure at that time - could be a consequence or cause
There are several other reasons - from simple anaemia
to brain problems - that can cause this
The best approach will be to see Ear-Nose-throat specialist - you need examination and some basic blood tests. / if there is no problem, then a neurologist
is the one for further assessment and assistance