Look, people can give all the advise they want. But, damn it, no one can diagnose you on a web site. You need to go see a good doctor, probably get appropriate imaging, perhaps nerve conduction tests, an MRI, whatever.
Anyone who takes advice other than seeing a doctor is making a big mistake. In fact, I would personally want to go to a good specialist.

I asked below and I'll ask again. Have you had a nerve conduction test. That would rule out sciatica, (which is what it sounds like).

As a licensed chiropractor for over 40 years, you might look for a Chiropractor who has experience with athletes. Your request is virtually impossible to solve without an in person evaluation by a this kind of practitioner.

Sounds like you may have hurtinlegitis, possibly. See a doctor - no one on here gives medical advise (or no one should unless they're an actual doctor.)

We promise, though, that we won't pray for your leg. XD

If you have pain that prevents you from doing your normal activities and that pain doesn't resolve or improve within a day or two, I would definitely have it looked at by your PCP. If it's sharp pain OR redness, swelling especially behind one leg, I wouldn't wait. It could be injury or over exertion or it could be circulatory. None of us can assess your pain online. What is your gut telling you...are you worried or do you have a feeling it will pass? Usually we are our own best judge.

Please get thee to a doctor. I work in disability claims. Knees and hips are wonderful and complex, and can mess you up. Maybe it is nothing, maybe it is age. But seriously, the doctor has years of training and great machinery in his office. If it is nothing you have peace of mind. If it is not nothing then you caught it early and might save you some pain and time on down the road.

You should get checked out right away. If it is a blood clot, some of the advice you are getting here can be quite detrimental. I thought my pain was muscle/tendon related at first and it almost killed me.

I think that you need way more walking but not in one go. Just pace yourself and get walking.

WebMD will tell you your'e dying; it always errs on the side of caution. I'm constantly pulling muscles and pinching nerves; I use cold to numbing warm to relax. Stretch gently when you're warmed up. Definitely google the anatomy and symptoms, then search for stretches. If it gets severe or lasts, go to the doctor.

Was it a sharp, electric shooting sort of nerve pain or more like a tendon/muscle strain or spasm? N what region of the leg? If it felt like a tendon or muscle pain towards the top of the leg (the hip flexor) you should look into yoga for psoas tension release. That’s the tendon that runs over the hip and connects the top of the leg to the bottom 5 vertebrae of the spine n it’s super important for alignment n posture of your whole body. If it’s a nerve pain running up the back of your leg it’s the sciatic nerve. Those seem like the most common/complex leg problems you usually hear about and there’s yoga stretches on YouTube or wherever designed to help with each.

I would research things online. Cross reference articles to be sure.

It may take you a while, and lots of work, but the answer is out there.

Alternatively visit a chiropractor, if you have the money. It sounds like a tendon.

You probably have stenosis in your spine. That means the nerve conducting electrical signals to your legs is compressed. This situation may well require surgery as the nerve can die.
Generally, they do MRIs of your spine, as well as tests of your electrical connectivity down the spine.

I had the condition, and was told it was permanent. A structural integrationist, (like a Rolfer) opened up the distance in my spine, and I was fine.

Could it be sciatica? That is usually more of a shooting pain though...

Could be a DVT bloodclot. I've had those.Don't play, get it checked out.

lol @ praying for your leg
[nih.gov] might be a good starting place.

above the knee? below it? in the knee? in the calf? in back of the quad(large muscles above the knee) which would be the hamstring?

Do a Google search for anatomy.

Without being able to run tests your description sounds like PAD or maybe inflammation of a joint or nerve. Hard to say.