I don't know most of the meds but yes, certain combinations of meds can drop your blood pressure. Hope things improve for you.

You probably need to have your medications adjusted. Visit your cariologist!

Absolutely and you have found the culprit. I was experiencing lightheadedness and sometimes dizziness when I stood up too quickly. Upon informing my cardiologist he reduced my metropolol intake by half. Symptoms disappeared good luck.