Headaches and pulsatile tinnitus

I suffer from almost daily severe headaches that often last for hours, sometimes linger for couple of days. These headaches usually start upon wakening, they often wake me up.  I work grave-yard shift and actually only get couple hours sleep at a time and I notice the headaches are very bad on my nights off when I lay down and get more sleep than on other days.  The assumption from pain management doctor has been that these are cervicogenic headaches due to numerous cervical probs--herniated disk, arthritis, bone spurs.  The way the headaches feel to me is that there is an increased pressure in my head, and I've always felt that they get worse when I lay flat for longer amount of time because the longer I lie down, the worse the pressure builds up.  Last week, I was awakened by a loud whooshing sound in my head.  Went away about 30 minutes of sitting upright.  I've had it about about 3 times since then, but not as loud as the first time.  As a LPN, I recognize this as pulsatile tinnitus.  It can also be heard  on right cervical with stethoscope.--called a cervical bruit.  This would often signal possible artherosclerosis, but I am wondering if it is actually related to my neck problems.  Hoping someone out there might have had same problem or have some knowledge in this area.  Could my cervical spine problems cause pressure on the cervical blood vessels and cause a bruit?  Could the bruit have been caused by a small tear in vessel caused by cervical manipulation (I just completed 3 months of physical therapy to neck)