I woke up early AM to use bathroom and was so dizzy, had to go back to lay down. Felt fine laying, then tried again and got nausea, did not throw up. Finally after getting on my feet, took a while, but gradually up and about and day and 1/2 later feeling normal. Stroke? or what? I am on baby aspirin and have been for many years and also when Dr. saw me that day, said vital signs were normal. Will this happen again?