Hi Mona, there could be a number of things involved with your swelling. As a starter, take a two or three days off for rest, and use RICE to help with the swelling. When you do return to running, start with about half the distance and a slower speed (longer pace). This will give your body more time for recovery and will allow your body to ease into running. Run heavy/light and use the 10% rule to increase your distance. Run a comfortable pace in which you could talk with a running buddy, and forget about going faster. That will come later in your training. Here is a page that briefly explains heavy/light and the 10% rule.

http://runninginjuryfree.org/2008/08/coaching-running-on-internet.html

Here is my page on RICE.

http://runninginjuryfree.org/2008/09/injuries.html

Here is a page on tips for preventing injury.

http://runninginjuryfree.org/2008/10/preventing-injury.html

Running damages body cells and is thus destructive to your body. During rest after you run, your body repairs the damage to the cells (recovery) and becomes stronger. Thus, it is critical that you have sufficient rest between heavy runs. In addition to running heavy/light and following the 10% rule, take a rest week once a month in which you run about 50%-70% of your normal weekly distance.