I have constant headaches,mri's show up nothing,theyre doing lifeline screening in my area where they check plaugue buildup in your blood,i have high cholesterol so im wondering if these tests might reveal whats really going on.i signed up for it?

The lifeline screenings do look for evidence that there is something reducing blood flow to the distant organ/tissues. I would not expect it to explain chronic headaches, but the studies could provide peace of mind or evidence you need other studies.

It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!

There's an unfortunate stream of questions on this site that ask, in essence, can the results of a test diagnose my problem. No. Drs use tests, based on physical examination and health history, to flesh out their train of thought. Tests and imaging have to be interpreted by the prescribing practitioner in light off their original diagnostic findings. Talk this over with your Physician.