Hi, I'd like to help you with your question.
It sounds like there is something in your past that might be causing your panic attacks and depression. It is often the case that when someone suffers with these types of symptoms, they were abused as a child. Is this true for you? If not, where there other issues in your childhood or as a young adult that you feel would trigger these symptoms? Answering these questions will help you start to understand the root of your symptoms.
When you start to feel anxious, there are things you can do to help yourself. First, remember to breath. That may sound strange, but often with anxiety people take shallow breaths which makes them more anxious. So remember deep breaths. Remind yourself that you are safe. These are only feelings you have and they will not hurt you. Allow the anxiety wash over you. Accept it. The more you accept it, the less hold it has on you. Practice these techniques as much as you can. Then they will become automatic each time you feel anxious.
There are two things that help with anxiety and depression. One is seeing a therapist. I know you said that you lack the time right now to see anyone. But you may want to try to fit it in. Therapy is an important part of recovering from anxiety and depression. It can make it easier for you to cope so you can accomplish all you want to. Even if you saw the therapist once every two weeks, it's still more effective than nothing at all.
You mentioned that you saw one before. Did it help? If not, keep trying to find a therapist that you can work with. You can ask your GP for a referral. Or if you attend church, talk with your pastor. You can also search on line at http://www.itsgoodtotalk.org.uk/therapists/ and http://www.bacp.co.uk/.
Two, you can work on this issue yourself. Time being a factor for you, these are resources that you can read a piece at a time. Here are some I recommend:
The Anxiety & Phobia Workbook (New Harbinger Self-Help Workbook) by Edmund J. Bourne
The Cognitive Behavioral Workbook for Anxiety: A Step-by-Step Program by William J. Knaus
Self-Coaching: The Powerful Program to Beat Anxiety and Depression, 2nd Edition, Completely Revised and Updated by Joseph J. Luciani
You can find these on Amazon.com or your local library may have them for you.
I hope this has helped you,