Hi.
Yes, much more info is needed. That said, the advice to take the bass to an expert is the safest one.
For starters, Your profile says you have multiple basses, which one is it?
Anything's repairable, but generally if the rod itself is stripped, not the nut which is easily replaceable, a non-vintage bolt on neck is "donated"

. To a local luthier or to the dumpster, Your choice.
Regards
Sam