I started changing little things. I started sleeping more.
I made it a point to do a 6 Km walk everyday.
I cut down on alcohol.
I stopped seeing people whom I had wanted to avoid for a long time but was not doing so out of social pressures.
I started seeing my parents more often.
I also signed up for an online meditation course.
I started working less ( Looking back, this maybe was the most effective thing)
It takes days to overcome a full fledged panic attack. For days you would dread that you might get another panic attack when you're least expecting it. Like when you're in office or when you are driving or when you're shopping.
I have changed my lifestyle and I can tell you I am quite happy after I did so.
I hope OP also experienced something similar.