Its 3 weeks after leep procedure and on having sharp pain like an electric current attack like 6-7 times then goes away on its own and then get it again after a few hours the same way. is it nerve damage or infection or something else?

It can take 4-6 weeks for a complete recovery after LEEP so pain may still occur after 3 weeks. Nerve damage should not happen with this relatively simple procedure but infection may but it should be presented with abnormal vaginal discharge. Please call your GYN doctor if any other symptoms besides occasional pain. You can take advil OTC for a couple days and see if you can suppress that pain.