I've had a panic attack a few days ago. but now my head feels heavy at the back and feels like pressure. can it be because of the attack?

Doctor can evaluate: About odd head symptoms... most people get a headache at some time, such as from colds, infections, lack of sleep, too much driving, long hours on the computer, stress at work, etc... A bad or increasing headache, recurrent headache, weird headache, or one that won't go away needs to be examined by one's doctor. Hard to guess what happens in any one particular individual's "panic attack."