I did my first ever run today and it was horrible! After the first 60 seconds of running my chest was very tight and it was quite pianful. I only managed to do a brisk walk for the rest of the 30 mins, but I guess its better then nothing. Even now an hour or so later after running, I am very wheezy and have been coughing a lot. Is this just because I am very unfit and need to take it slower or should I go see the doc? I am overweight (im about 12.5 stone and 5ft4) and it has been a while since ive done any regular exercise, but I wasnt expecting to be in quite so much pain!