Sciatic Nerve/Spinal Problem?

I have lower back pain that seems to go actually to the front of my right thigh down to my knee.
If I walk enough, it goes all the way down to my ankle with a kind of numbness.
The pain can be very sharp at times also. In the morning when I get out of bed, I hurt pretty much until I have a bowel movement. After that, the pain is reduced.
It is particularly noticeable when I walk a couple of blocks or more.
It can get really bad. Bad enough that I have to stop walking and relax a bit. Preferrably sitting.
Standing and trying to find a comfortable position seems very elusive. Laying down is also uncomfortable most of the time, but not always.
It feels like a nerve problem.
It doesn’t feel like muscles or bones.Can you tell me what you think? Thank you.BillPhoenix, Az.