I stretched and now i have been dizzy for about 3 hours?

Sounds like you need a checkup. I cannot link stretching to 3 hours of dizziness unless it is a symptom of an underlying medical condition. Healthy people will not have that happen. If this subsides shortly schedule a visit with your doc. If not, go to urgent care.

Depending on how you stretched, this may not be related, unless you also twisted your neck. Without much other history, would be hard to make a diagnosis here. Be sure that you have been eating and drinking well, have no fever or other symptoms, no trauma, no anxiety or stress...please contact your doctor to be seen or get to an urgentcare or ER if it persists.