I absolutely understand! I've had problems with anxiety and panic attacks for years off and on. I had been through a good 3 or 4 years with very, very few symptoms (it was amazing! It gives me hope that I will be back to that state again someday!), but when I started grad school a year and a half ago, that all changed. I became so overwhelmed with the new schedule, new school, new city, that I had extremely high anxiety. Anyway, I handled it ALL wrong-- I pretty much started drinking the anxiety away and have overall made it so much worse. Please don't go down that road!
I'm glad to hear you've already set up an appointment with a psychologist. I'm looking for a new one myself. I personally had a lot of luck with some group therapy sessions with others about my own age going through some similar issues. You may want to look into something like that in your area if that sounds useful to you. As for things I do on my own to help my concentration and ease my mind, I find some meditative practices helpful. I use binaural beats and some guided imagery exercises. I go onto youtube and type in "binaural beats anxiety" or "guided imagery anxiety" and have found some nice calming things there. Just take ten or so minutes and focus your mind on what you are hearing-- this helps me kind of get out of my own head and get back to reality a little bit. I have also had a lot of luck with progressive muscle relaxation. The one I use is by Brenda Saucedo, you can find it on Itunes to download for like $5. So worth it, her technique of relaxing the muscles, thereby relaxing your mind can be really, really helpful sometimes!!
Otherwise, taking a time out when you get frustrated and going for a walk or getting some kind of exercise can be good. Sometimes I find I just need to allow myself to be distracted for awhile and walk it out. Journaling has been good for me too. When I get overwhelmed with panic, I run to my journal and write out every possible negative thought I'm having. It is cathartic for me and helps me to feel as though I'm getting some of that out of my body and into something else. From there, you can see where you are having irrational thoughts and can then write out more rational responses to them or positive affirmations (similar to a more structured "Thought Record" exercise that they give you in therapy a lot of times. You can google that and find writing exercises if you like that idea as well). I drink a lot of calming teas (I love Sleepytime Vanilla!), which is sometimes effective. Some people take Valerian Root (the plant that they get Valium from). I haven't taken it lately, but I just bought a bottle to try again. In the past, I have taken it for sleep and have had mixed results, but I haven't taken it for anxiety specifically.
Anyway, I hope these suggestions help you! It has been a rough road for me, but if I had just started out using these techniques from the get go, I would be SO much better off right now. Stay strong!!