Oh Justjules, I feel so sorry for you. What you are putting yourself through is far far worse than visiting your GP. The trouble is at this age there are so many things that are aching (or just downright falling off), that there is always something new to worry about.
I wish I could offer some advice on how to deal with HA, but I can't. I've never suffered with it and have no experience of it BUT can you 'change places'? Can you imagine that your child is struggling with what you're experiencing at the moment. What would you advise them to do? I bet you'd say, 'right come on let's get to the GPs, get this sorted, let's put your mind at rest'. I bet you'd stuff them in the car and set off immediately!
Forgive me if I sound preachy. I know that you are a bright, intelligent woman, that you know you are causing yourself greater hardship just worrying about this instead of going to the GP. It is almost 100% likely to be something minor and benign, you will skip home afterwards, with the weight of the world lifted from your shoulders. If it did turn out to be a nasty, well it would be far worse ignoring it anyway, far better to catch something early and get it treated!.
Now you can tell me to clear off and stop preaching!

xx