Withdrawal headache symptoms and conditions

Have been taking Diovan HCT for 2 1/2 years increasing dosage to 320 mg. Good control of blood pressure, but have developed severe pain in low back and hips, with pain, numbness of feet and legs when walking. In fact unable to walk more than 3 blocks without legs and feet going completely numb, sore and stiff to the point of stumbling and falling. Told Doctor about it 3 months ago and he suspected PAD, for which I was tested. The good news is that those test results came back negative. Doctor doesn't think Diovan can be the cause of my symptoms, so I made an executive decision and stopped Diovan 2 days ago and after "withdrawal" headache first day, have noticed marked improvement in hip and low back pain. Feet no longer go numb, but am still having some discomfort in calves.