How does a panic attack start? This has happened to me a couple of times in the last month. Just sitting there and out of the blue I get a head rush and then think I am going to faint. I don't faint but I feel really strange and then am EXTREMELY nervous. I feel the need to move around but am afraid to because I am afraid I will faint. I shake my leg and tap my foot like crazy until the feeling passes which usually takes about a minute. I feel slightly off the rest of the day. Probably from the rush of adrenaline. The thing is that this happens out of nowhere when I don't seem to be particularly nervous. I get no warning that it is going to happen. It is very scary. Does it sound like a panic attack??