I think a diagnosis is best from GP, though having had sciatica, I know it started for me with back pain, as I do have spine arthritis.
Don’t have neuropathy, which I believe starts in feet, though not 100% sure about that.
The spine pain does sometimes give numbness / tingling to outer thigh. Scaitica can be worse first thing in morning, and usually eases as the day goes on and I move about. Also, goes away after a couple of weeks. Don’t think neuropathy resolves easily, though perhaps somebody who has neuropathy will clarify.
As I mentioned, best to discuss with GP.