Headaches, rt leg sciatica, rt arm tingling, low back pain, possibilities?

Disc disease. Headache and right arm tingling maybe caused by nerve impingement in your neck. Low back pain and sciatica may be caused by the same in your lower (lumbar) back. You should seek help from your doctor especially if you develop weakness, change in vision, or incontinence.
Spine Injury. This pain in the distribution as you suggested is the result of an irritated nerve or facet joints or other injury to the spine which are caused by herniated disks, spinal stenosis or degenerative disc disease, etc requiring further evaluation by a spine specialist.
Cervical stenosis wi. With lumbar disc herniationjeadache fromiscle tendion around sore meck and arm pain see primary care for physical.