Hello and welcome to HCM
It is matter of concern because of slurring in speech and vertigo
. In my opinion consult neuro specialist and get your MRI
head done. Also rule out Cervical Spondylosis
and blockage in the external and internal carotid artery
by doing X-ray C. Spine and Color Doppler of Carotid arteries.
Hope these investigations help you to get to a diagnosis.
Best Wishes and get well soon