Exercise

I have found Exercise to be of huge benefit in dealing and living day to day with anxiety and panic. I started slowly just by walking 3 days a week for 30 minutes on the treadmill. I then got stronger and less afraid of the intensity. I would walk and then run as long as I could then walk again until eventually I ran for the full 30 minutes or more on some days. As I progressed I changed it up with 15 minutes of warm up and strength training then running then jump rope and cool down for 5 minutes. It helps to change up the routine so you don't get stuck and bored and your body continues to get the most benefit. I have been working out now 3-5 days a week for a year and a half.
I can't stress to you enough how exercise is so beneficial to people struggling with anxiety and panic. With these issues it is very easy to fall into depression and by working out it keeps your brain chemistry in check. The endorphins you release while working out keep you balanced. It is like your weekly medicine. The only side effect is feeling great and warding off depression. I have anxiety and panic but have been free of depression and depression like moods for a long time due to my lifestyle change.
When you work out you kick in your body's ability to loosen the tension you keep and get rid of the effects of stress that are put on your body due to anxiety and panic. The tension, the adrenaline, negativity, and the restlessness. They are alleviated by working out consistently. It is though you are reversing the effects of the whole days worth of stress. The key is consistency though. You have to do it a minimum of 3 times a week to feel full benefits. It is well worth the effort.
Many people who suffer with panic attacks may have a fear of working out due to the similar feelings of an actual panic attack ie heart pounding, sweating, heavy breathing, etc. That is why I encourage you to take baby steps as I did. Getting a physical and letting your doctor know you are wanting to start a workout program is great too. Once you are done with the checkup and everything is fine you will feel much better. You can start your program with no worries. Then take those baby steps and as time goes on you will feel so much better you won't ever want to stop working out due to all the great benefits you will experience.
Give it time and true effort. There will be plenty of days you might want to forgo the workout but think of it as the medicine you need weekly. You have a choice to put the control of your life in your hands and take responsibility for how you feel. I still have days I would rather not work out but I just remember it is my medicine. I don't want to feel bad and it is not only good at helping me cope with anxiety it is good for my heart and body as a whole.
Don't be so hard on yourself there will be days you just don't feel up to a hard core workout and just walking is fine. The important thing is to get that extra energy out, alleviate tension in the body and bring those great endorphins out so you feel good. No one is asking for perfection just a way to feel a little better and cope more effectively.