hello doctor I am a 54 year male 5.7 weigh 174 pound and recently I went to the hospital because I had shortness of breath ,what I felt was that my throat was getting tight and Icould not breath easy,in the hospital they could not find anything wrong and they diagnosis was that I had a panic attack and gave me a pill alprazolam 0.25 mg following days I have felt the shortness of breath at times but mostly when I eat passing the stage of satisfied to be feeling full,my doctor recomended me to see a cardiology which I did and he found on the stress test that as I understod the bottom part of the heart is not getting enough flow ,all the other 2 test he did pass ok,so he is going to performe a cardiac catherization to be sure that is not the problem of my shortness of breath, my question is ,is this procedure painfull, what will I feel and usually how many days I will be not able to work