I know that I have had varying and similar symptoms at different times over the last few years, but I am not sure my response would help to remove your health concerns. Therefore I hope you find my further thoughts more supportive to your concerns...I know they help me when I'm not sure where to start or what to do!
...I know this is easier said than done...but, what's the good of worrying as it wont change anything. With health issues there are nurses, GP's Hospitals, specialists etc, all there to help you with your specific health concerns. Rather than worry, why not pursue a goal to find out information to deal with your health, then if you want you could share the knowledge with the forum if you would like support. I have certainly found the topics covered by the people on this forum very encouraging and informative.
Best of luck