Hi Anyone had/have Pericarditis?

I did, many years ago. They put me on heavy doses of Motrin for two weeks and I also had to rest during that time (in the middle of training for my first half-marathon, I was going stir-crazy by the end!!) Normal actually took at least a month, and I was able to run the half-marathon, but I had to take baby steps and not push it for a while after. You will get back to normal, but the most important thing is to listen to your body as it recovers and not push too hard. If you do, you will end up aggravating it and needing to rest again and again. Take it slowly.

Sounds like you have had a much worse case than I did. I went to the ER for one night because I was having stabbing pain in my chest any time I tried to breathe- I had no fluid on my lungs. Did you have pericarditis and something else (the infection?) Pericarditis is just swelling of the sac around your heart-the lung fluid may be something else altogether.
Good for you for going ahead and cancelling your half. Take care of you first! No fitness or weight loss goal is as important as your heart and lungs. Good luck!