That's quite an analogy "like being tortured by someone who knows how to inflict the maximum amount of pain whilst keeping you alive and conscious". I used to say that anxiety/panic like dying a thousand deaths, but your description is even more piercing.
The type of "meditation" I do would be closest to "mindfulness meditation", but what I do is actually more targeted for anxiety. I'm not allowed to post any links here, but you can find it on google by searching for "self therapy for anxiety".
However, I must stress that what's right for me is not necessarily right for you. And you also mentioned that you're using medication - a few people have told me they had trouble with my approach while on meds.. My guess is that this is probably because the exercises are geared toward "interacting" with emotional energies, but most anxiety/depression medications have already dulled those sensations, in which case the usefulness of the exercises may not be very apparent.
So perhaps this is not the best option for you right now (I don't know), but I mention it just as something to keep in mind for the future. It probably wouldn't hurt to listen now, but your doctor's advice should be a priority (I am not a doctor - so anything I say should only be considered as my person perspective/experience).
P.S. Does it seem kind of strange that your doctor would not say "you have", but would go ahead and prescribe prozac without such information/diagnosis?