How to help someone with a panic disorder

Telling someone with an panic disorder to "just calm down" could actually increase that person panic attack, remember during a panic attack those of us with an panic disorder wants to calm down, so telling us to calm down doesn't help, that's like telling someone with a stomach flu not not to vomit.
Rather than saying "calm down" ask that person if there's anything you can do to help, if that person said yes, just please sit next to me, but ask me any questions about my panic disorder, that's all you have to do, sit next to that person, it might be boring but remember, having a panic attack isn't fun.
Don't give a person with a panic disorder, and social anxiety and looks, that person could think you're judging them or talking behide their back, even though you're not.
If you want to help someone that's an agoraphobic, and that person haven't left the house for sometime don't push that person to leave, if that person walks out the door, and said "I'm going for a quick walk" just say ok, enjoy your walk, if you're worried, and you want to go with that person, say "hey, I wouldn't mind going for a walk with you" if thay person says "sure I would like that" don't talk about his his or her panic disorder, talk about something else, we don't want to be reminded of our panic disorder.
Now if you're not going with that person, and he or she came home within a few minutes, don't say things like "why didn't you go for a longer walk, you were only gone for 5 minutes" don't say anything at all if that person looks upset.
If you know someone that has depression, don't say "why are you so lazy, how hard is it to get off your bed" don't even say things like "I hate Monday's because is a start of a new work or school day" that person that's depressed or is an agoraphobic wants wants to work, wants be able to leave the house.