my son has been suffering from low blood pressure for about 2 weeks. He can t find what is causing it. It is 89/70, 90/70, sometimes maybe 101/70. He does have depression and take other meds magnesia Oxide 400mg (on his own not prescribed), Zolpidem tartrate(ambien) perscribed, mirtazapine 15mg cyclobenatrine(muscle relaxer) Hcl 10mg, Hydrozine, hcl 25mg 3 times a day, omprazole 20mg Would a combination of these meds cause his pressure to lower his pressure. The Dr. says she is going to refer in to a cardiologist. Please respond. Thank you. J.R.