Hi Emma_Lee
I know exactly how you feel. I have been feeling like that for a loooong time now...that is up untill Wednesday when a dx of Marfans was finally confirmed, once and for all. It has allowed me to breath a bit easier as all these pains, aches, problems and whot-not finally has a reason and it's not just in my head.
Anxiety can cause a lot of ache's and pains and anxiety over those pains in turn can cause even more. When you get anxious, you contract all your muscles, causing them to go into spasmism, which in turn causes other muscles to contract and so forth. The best is like what MsCarrie says...relaxation.
What you can try, is to make note of when things happen. You might find that a lot of times the ache and/or pain passes after a while, never to return (Sometimes, you might even feel silly for having worried about it in the first place). If you do find a definate pattern, then you can start thinking of paying a visit to the GP...just to be safe...as at that point there more than likely isn't anything to be really concerned about.
I am very carefull of, and I have MsCarrie to keep me on my toes about it too

, getting too overly excited about my heart problems. I get a lot of chest ache's and pains but that is not to say it's the cardio-condition. A lot of it is due to Anxiety and most of it is due to the fact that my rib-cage is not held together like it should...but you wouldn't need to worry about that part

.
I hope this doesn't sound mean or anything and that you get my meaning, but..there is an old saying of "Where there is smoke, there is fire". So, unless you can smell smoke, you are going to waste your life, standing with a bucket in your hand in front of a forest that is not burning...while in the meantime, you could have been enjoying the river that is flowing through it.
A lit match on it's own is not dangerous and a puddle of fuel on it's own, is not dangerous either, in fact they can be very usefull when combined with other things. Now if you were to touch the lit match, you might burn your self a bit but still no real harm done. Combine the match and fuel, however and it is a totally different story.
I hope you understand what I am trying to say... I want you to be calm and confident that you don't need to worry about what MIGHT happen.
In my condition, there is a "stacking up" of problems. Most of the complications in my life, is complications that any other human could have without any problems or worries. What makes it dangerous to me, is that there is the combinations...like the lit match and the fuel.
You do need to take care of your health and eating fruit is very good, but stressing over things that is not happening, can give rise to other problems. Leave that in the hands of doctors untill they say "Ma'm...we have a problem".
I hope you were able to understand some of my babblings

It's just that I really want to help you find peace of mind, as I know all too well how difficult a situation like this is.
* HUGS *
Seraph