Hello I love sweet,
Dangerous by the way! Sugar and spice aren't all nice! The road to obesity and diabetes and a host of diseases.
I agree that this is probably not meralgia paresthetica. When you say your shin, do you mean the inner shin? It sounds more like a femoral nerve lesion, rather than it's sister the lateral femoral cutaneous nerve which doesn't extend below the knee.
Both come from the mid to upper lumbar spine, but you make no mention of a history of low back pain.
The fact that this is aggravated by walking, relieved by sitting, suggests the hip should be examined too. Lie on your back and pull the knee to the chest, to the opposite shoulder, and then place your foot on your opposite knee and let the knee drop out in the lotus position. Any hip groin lateral thigh pain? Compare the good and naughty legs.
Try pricking your leg with a pin and see if there is a change in the sensitivity. Bounce on your knee. Any weakness in the quad?
You're getting anxious because of the unknown. Go and have a thorough examination and find out what's causing these pains!
Dr Barrie Lewis DC