Likelihood of experiencing panic attacks

I went to a friends funeral on friday 20th april 2009 and felt fine, then the following day, saturday i suddenly went very disorientated and felt tired and unsteady on my feet. I went outside to get some fresh air but to no avail. I know that when i have been quite active i get post exhertional malaise, so i got comfy on the settee and relaxed. About 20 minutes into relaxing i couldn't lift up my arms or legs and when i tried to get air in, i couldn't. My partner opened all the windows and doors and put me into a sitting position but it took until the forth attempt for air to get in. I struggled even then and it felt as if only a tiny amount was gettin in. Both my hands and arms were numb upto the elbow and this took approx. 10 minutes to rectify. My partner said that my lips went very pale during the attack and i had to go to bed straight after. Since then i have been ver off-balance and totally shattered, with very poor concentration and patience. Is this normal ?