I am sorry that you are going through this ocean. I did post links for books on health anxiety in your other post on this subject...
...but for now, one quick exercise that you can do is to write down all of your current concerns. Then make two columns. In one column write down the true facts that support your fears. In the other, write down facts that speak against the worry. You will most likely find very few supporting facts...if any at all...but you will be able to come up with quite a few that disprove your fear I bet! There are more thought challenge type worksheets to be found here if you'd like to try more:
http://www.get.gg/freedownloads2.htm
Exercises such as these help us to look at the situation rationally, rather than just letting our minds run wild with scary and worst case senarios.
I hope that you can give this a try and find some relief.:)
S.C.