why do I have hypertension laying down but on my left side when I'm laying on my right

There could be a few reasons for this phenomenon. One possibility is that there is an underlying medical condition, such as sleep apnea or certain heart conditions, that is causing fluctuations in blood pressure based on body position. Another possibility is that the way you are positioning your body is affecting blood flow and pressure in a specific way. It is important to discuss these symptoms with a healthcare provider to determine the cause and appropriate treatment.