Hello paulineej: I see this is your first post here on PC. So... welcome to PsychCentral!

I hope you find the time you spend here to be of benefit.
I doubt I can really be of much help with regard to your concern.

Yes, it is possible your concerns are "all in your head", so to speak. But it's also possible there is really something wrong... perhaps some type of chronic illness that the doctors you've seen simply aren't identifying.
Sometimes one simply has to doggedly pursue answers to these types of conditions until the correct diagnosis is finally made. Of course, your anxiousness around calling offices does make this doubly difficult. If you're not already doing so, perhaps seeing a mental health therapist might be of some benefit.
Here are links to some articles from PsychCentral's archives on the subject of hypchondria that may be of some interest:
https://psychcentral.com/lib/tacklin...-worried-well/
https://psychcentral.com/blog/archiv...-hypochondria/
Also... PsychCentral has a sister website: "NeuroTalk". There a lot of members over there who have struggled to find answers to some very difficult illnesses. You might also take a look at the forums over there & see if you see anything you think may be helpful. Here's a link:
https://www.neurotalk.org/
I don't know, of course, if you're here simply seeking advice with regard to this particular concern or if you plan to hang in here with us.

However, should you be planning to continue on (we hope you do)... may I suggest you introduce yourself over on PC's New Member Introductions forum? Here's a link:
https://forums.psychcentral.com/new-...introductions/
There's a lot of support that can be available here on PC. The more you post, & reply to other members' posts, the more a part of the community you will become.

Plus there are the chat rooms where you'll be able to interact with other PC members in real time (once your first 5 posts have been reviewed & approved.) So please keep posting!