Hi majidah, and welcome to the forum.
I haven't had full-on panic attacks over talking to a therapist, but I've definitely had a lot of anxiety and doubt about it. I've been looking for a new therapist recently and although I know I need to see someone, and sometimes feel desperate to, there are also times when I suddenly think it would be the wrong thing to do.
I think it's a natural reaction. Who wouldn't resist taking a risk talking to a new person and stirring up so many difficult feelings? But I know that it's important to do it so I can heal, rather than continue dragging myself through life.
I'm sorry it makes you feel like a sideshow. I hope the therapist you talk to is sympathetic and sensitive so you won't feel like that. You don't have to tell your story the first time you meet, it can be enough at first to say something general. I know there's a minimum amount you might have to say, and having to talk about symptoms and life struggles can also be tough, but my approach now is to say very little at first, and even say that I'm not ready to talk about something yet. I think it's good to take time to get to know each other before starting to talk about anything in more detail, anyway, so that when you do start to it feels like you're confiding rather than being examined.
Good luck on Thursday. I think it's great that you rang the help line and then set up an appointment. I'd suggest thinking about it as getting a sense of what the therapist is like and whether you feel you could work with them, rather than seeing it as you being under the microscope.
Hashi
PS I don't know my way round the forums very well myself, yet, but I know there's also a forum particularly for therapy as well as this one. Maybe there might be some threads there that could help you figure things out.