Agree with AnnieB.
There is some evidence it is mood-lifting, and may help some people with some symptoms.
There is no evidence it’s an effective substitute for DMDs - I don’t personally think they’re in the same niche at all - and I have absolutely no axe to grind with respect to DMDs, as I declined them, but am still doing very well (touch wood). So I’m not someone who has strong feelings that you’ve got to be on DMDs. I just think that whatever your choice, it should be with accurate information, and the suggestion LDN is in any way on a par with DMDs is misleading. That doesn’t mean you might not find it useful in other ways.
As I understand it, you can’t combine it with opioids such as anything containing codeine (just in case you were already using those for pain relief), although I seem to remember somebody posting something recently suggesting it might be OK as long as you were very organised about the spacing of the doses, always ensuring sufficient separation.
But that’s obviously something you’d have to look into further if you wanted to try it, but already use opioids. It might not be an outright no, but they’re not really compatible, so precautions would be necessary.