It is vital you have someone you trust 100% during a panic attack as they can stop you doing something stupid. I've tried being alone, I've tried finding people who are supposed to help but the only real way to deal with it is have someone you trust. Even if they can't be there in person and you have to call them make sure you know someone who you have really built up a rapport with who, most importantly, can stay calm. There is no point finding someone when you are having a panic attack who is going to have one when they see you.
If you try to cope on your own there is a very good chance it will get worse or you'll do something which could hurt you or someone around you.
If you have the wrong person you can't say what you feel and there is also the likelihood that they will put a foot in it and say something they shouldn't have.
Like I said at the start, you might not always be with the people you trust the most. I'm not going to lie, there is a place where I don't feel like I trust anyone enough so have a phone at the ready. Have a list of people you can call. Someone will pick up. It's not the best but it's better than talking to someone you don't want to talk to. Speak to the wrong person and say the wrong thing and it will come around to bite you on the ass and hard. I learnt that the hard way!