About 8 years ago I went through a similar time in my life. My marriage was breaking apart and I was also breaking up a business partnership. Needless to say, there was a great deal of stress. I had the same symptoms that you had plus the left side of my body went numb during a meeting and I had a momentary loss of the understanding of speech. I was rushed to the hospital and had every test performed on me. They ruled out stroke and heart attack. I had stress tests performed and all checked out fine. At that time I was running 5 - 8 miles daily and working out in the gym 1- 2 hrs per day, so physically I was very strong.
Anxiety and stress can play real nasty tricks on your body. The spells continued for at least another year. Chest tightening, dizziness, loss of equilibrium, shallow breathing, and faintness.
While this is happening you can also loose you natural rythm in breathing with only exacerbates the problems.
The most important things you can be doing during these times is to take moments during the day to relax.
Try not to drink too much. Get enough sleep for your body to deal with the stress. VERY IMPORTANT!!!!!
Deal with the causes of the stress quickly and rationally.
Don't let pettiness get in the way resolving the issues causing you stress. Going through these type of attacks over a long period of time can take a real toll on your body and cause permanent damage.
If and when an attack happens again, stop what you are doing put you head between you legs and breath slowly. Some people also bend down and blow into a paper bag. Trying to gulp for air or breathing faster only makes things worse. Try to understand what your mind is doing to your body, and deal with it calmly.
I was initially prescribed with anti-anxiety drugs and found they didn't work for me. Although everyone is different. I did not want to be dependent on a drug to help me cope.
Hopefully some of this insight will be able to help and not cause you more stress.
I am not a doctor but these are the things I found worked for me.
If I can be of any further help feel free to e-mail me.