hi welcome to HCM
-i had gone through your query and understand your concerns.
-there are several factors to produce dizziness
after waking. i would come with the possibilities of,Orthostatic hypotension
is the cause for your sufferings.
orthostatic hypotension;is a sudden drop in blood pressure that occurs when you sit up or stand up. and most suitable condition for you
other possible causes include
kindly rule out each and every complaint with appropriate tests like ECG,blood pressure,complete blood picture etc.
I hope this is helpful for you, thank you