Osgood-Schlatter is a definite possibility here. This is more congenital and makes more sense to me than some of the other possibilities. The other 2 possibilities are fibromyalgia and chronic fatigue syndrome. If you ever had herpes simplex, chicken pox, or shingles as a kid, which is rare, complications called post-herpetic neuralgia is possible. However, I am thinking that Osgood-Schlatter is possible. If you haven't seen an orthopod, you should. They need to do an MRI with and without contrast of the entire leg, knee, etc. If it is inconclusive, I would also get an evaluation for sciatica.
Here are the risk factors and symptoms of Osgood-Schlatter:
Adolescent
Leg Pain
Leg pains/squatting
Leg/lower extremity pains
Arthralgias Polyarthralgias
Arthritis Children
Joint Pains
Joint pains Arthralgias in Children
Knee Pain
Knee Swelling
Limp
back and below knee, down leg
Pain/tibial tubercle (tenderness)
Single Joint Pain
Demographics & Risk Factors:
Patient/Physically active
Patient/Rapidly growing Male Children, esp adolescents.
Check your vitamin D levels with 25OH vitamin D blood test. Low D and low magnesium cause cause insomnia, anxiety, depression, muscle/bone pain, etc.
You want you D levels above 50ng/mL. You can supplement with D3 and magnesium
Hey
Blood test is just one thing it won't tell you everything about your body. Do MRI or x-rays to check for broken bones as well. Is it possible that the pains be psychosomatic? Go to a physiotherapy clinic and have it checked.
What treatments are you doing to ease the pain? Have you taken pain killers? Put on pain relieving creams and ointments on the affected area? Massage is also advisable.