@Harro
Im a psychology student and have done much research on this issue.Just to share some ideas you can do.
Basically, you should ask yourself how long did u have such disorder.What causes it, stress, life event or so on. If you have such disorder for more than two years,it means things are getting severe and you should hit a counselor or a psychologist.
They will probably treat you with psychotherapy which varies.Some may be just dialogues and even hypnosis.The main focus is interaction and finding the problem in our brain known as id in psychology terms.
Never go for drugs known as anti depressants.Drugs are not the only solution.Besides,you will be dependent on drugs as time pass.Drug is not the BEST solution.
Consider having more interaction with friends and families.Tell them about your feelings and problems.Sex is another alternative too.
Take a rest and consider holidays.Releasing your stress and hectic work would be a good way to handle panic disorder.
Considering a situation that causes panic disorder,a good way would be conditioning.For this you need to find out what worries you and what causes your panic disorder.For example, you have fear on dark. You try to condition yourself in dark.
Reduce on substance such as drugs,alcohol,cigarettes and caffeine.This might help a little.
Lastly, the best solution is still to meet a qualified psychologist or a counselor for their professional opinions.
Good luck.