I completely see where you're coming from. I was on antidepressants for years and they did precisely jack. I came off them three years ago almost and initially felt great, but then I ended up under a huge amount of stress and the anxiety and panic returned. I then started using Diazepam on the lowest dose as and when I needed it, which wasn't daily. I have found that to be the only thing that has helped at all. I've been offered antipsychotics, other antidepressants but I don't want them because no one seems interested in looking into my diagnosis so I don't want to be treated like a guinea pig. My GP is happy for me to use Diazepam as and when for the time being. I am querying my diagnosis with a mental health worker who has recently been visiting me.
Once you are able, I would definitely get a second opinion. I don't know you so I can't say if they're right or wrong, but you do know your mind. The only thing I would be wary of is not to be afraid of a diagnosis because denial is often common if we're afraid or if we don't like what we hear. Not saying this is you, but perhaps something to keep in mind