Get a good exam from a neurologist who is a neuromuscular specialist. It sounds like you’ve had EMG, which should readily diagnose a median vs radial vs cervical vs plexus vs whatever kind of nerve problem, if the performing doc is good.
And don’t let Rip operate on your carpal tunnel to fix your “radial nerve shit” for god sakes. That’s the wrong nerve!
If you only get symptoms after training, you should get the EMG after training when you have symptoms.
You can search online for nerve distribution diagrams and see which fits your symptoms the best, but a good exam by a smart neurologist is the best bet for diagnosis. There is a numbness pattern for sensation and a weakness pattern for strength that correlates with each nerve distribution. Here’s a sensory diagram:
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If you do have carpal tunnel syndrome, you should first get wrist splints. Wear them at night, and for as much of the daytime as you can manage. Might avoid surgery entirely! You should probably get some wrist wraps for lifting too.