sunshine - you ask where this HA comes from. The same place as most of our behaviours and the way we function come from - our childhood. I have had HA in the past and so far have "had" MS, throat cancer and ME, but with several years apart. It is anxiety (meaning fear) that is fixated on health rather than anything else.
I think you need to look back over your childhood years and your parents and other important people in your life. Sometimes it is hard to figure out what could have happened in your childhood to make you anxious as an adult. It took a therapist to help me work it out, and it wasn't anything huge or bad. My parents over protected myself and 2 sisters and especially when we were ill - they sent for the Dr (as they used to come out in those days) I am 67 by the way. They fussed over us and drew the sofa near to the fire and all sorts of things like that. None of us had any serious illness, except my sister had scarlet fever, which was a big deal in those days, and she was in bed for weeks and had to be isolated in case we caught it. My dad put fairy lights up in her room and I recall the tremendous fuss that was made of her at that time. Also I remember my mom panicking over the normal cuts and bruises you get in childhood.
I was talking to the therapist about all this one day and she said "but your parents also showed you that they were anxious and worried about any of you being ill" and they have (unconsciously) passed this on to you. It certainly made sense to me.
I have talked to friends about this and one of my friends hates to tell anyone she is feeling ill (and she has HA too) but keeps it to herself, but I usually know and probe a bit and she finally comes out with it. One time she had been worrying that she couldn't swallow and her throat was closing up and getting worse and we talked about other times when she had felt she had something awful and it turned out to be nothing, other than stress of feeling she had something terrible. A couple of days later she phoned me and said it was a lot better but said she felt silly for getting so worked up, so I reminded her of some of the things I had "suffered" and we had a laugh about ourselves. I told her that in my early 30s with 3 kids, I was convinced I had MS and she shrieked down the phone that she too had thought this about the same time and had not got out of bed for a month! I asked about her parents (they were both pharmacists) and she said straight away "Oh no you couldn't be ill in my family, it was seen as a moral failure, and we were never taken to the Dr or took and medicines. So it's small wonder she will not talk about any illness (real or imagined)
My dil and her sister never complain about illness and I have seen them go to work when really unwell with coughs/chest infections etc and their parents were totally unsympathetic to them if they were ill as kids "we just had to get on with it"
SO maybe a walk down memory lane would help..........mind knowing where it has come from doesn't altogether cure it - had a black mole on my scalp a while ago and thought GP would say "oh just keep an eye on it" instead of which he was saying "oh it's got mixed pigmentation, and is raised and irregular in shape - it needs looking at" and referred me to a dermatologist on a 2 week rapid access, which is for when cancer is suspected. The appt came through 8 days later but I had convinced myself it was melanoma, but it turned out to be a harmless wart that the Dr just burned off there and then.