Hearing voices, depression and family...

Dunno whether this should be in the Depression Forum or here, so mods feel free to move this if necessary.

Anyway, I have been taking depression medications for almost 3 years and to be fair, they're not much use.

Now the reason that I'm making this thread is because of something else that is worrying me. Basically in the last year, I have found myself increasingly paranoid in public. It's developed from a feeling that I'm being watched all the time in public places to intense, paralyzing paranoia. I don't like being out on my own now.

Add to this a number of weird hallucinations and thoughts. I see black shapes in my vision flying about, and on a number of occasions I've seen actual figures, including a cat and a person in long robes.
I've also heard voices, including a weird laughing noise that I hear all the time just about, to muffled words, phrases and even clear words sometimes.

I've also come close to stabbing someone too, and the thing that gets me is that I didn't see this as a bad thing, if not a pleasure to me to see that person die (although I didn't go through with it)

Now it's pretty obvious that there's something wrong, but it isn't that simple. My problem is my family, who have in the past dismissed many of my health issues as me being silly. They don't take my mental issues seriously that I have had diagnosed and I'm petrified to tell them what's going on.

I'm scared, increasingly alone and I don't know what to do. I'm scared that if I go to the doctors, my family will react badly or at least not take it seriously.

I'm scared...