My best advice is seriously to go and talk to a professional. I don't know how you feel about that- many people are quite hesitant, as they think 'going to talk to a therapist or psychiatrist' is some kind of NO-NO....
They're people who are super-good at listening to people, and have been trained to help people like you and me to figure out what's going on, and help us get to where we want to be in life. What's so bad about going to see someone like that?
I used to suffer terrible panic attacks. Many times i'd start vomiting or feeling like i was about to, and i' have to go home immediately. First it was just in exams, than it was something else... It just kept snowballing until one day I was in Coles buying groceries and I had a panic attack so severe I nearly fainted... I had to dump my groceries right there in the aisle, and run out of the supermarket to throw up. I still didn't get help- it took me losing a relationship to get help. When I was at my worst, I couldn't work, I didn't have ANY friends, I spent all my time on World of Warcraft because it was the only way I could socialise with other people without having a panic attack.
But eventually I got help, and it slowly started to get better. My therapist would give me 'homework' and then teach me calming strategies and other techniques so that I could achieve that task. My very first task was to go to Coles and buy a bottle of milk. No joke- that's how bad my anxiety was.
The point of the task wasn't to NOT have a panic attack. It didn't matter if I had one. The point was to practise those coping and calming skills so that i could go and buy the bottle of milk EVEN THOUGH i was panicking and uncomfortable. And eventually, i just stopped finding that bottle of milk anxious anymore.
(To put things in perspective; I now have a full-time job, study part-time, and I play in a band performing to crowds of people- where i sing solo!! How's THAT for someone who couldn't buy a bottle of milk once?)
I swear by a type of therapy called 'Acceptance and Commitment Therapy". You can google it and see if it sounds like it'd work for you, and then find a therapist who uses it (it's very popular). There are some great apps for learning some relaxation skills. "Headspace" and "Smiling Mind" are both great apps available on iphone and android. It may seem unhelpful at first, but when you get a hang of those calming techniques, they really are so essential to help ease those attacks.
Good luck!
