Hi Beadbabe
RLR is right, my anxiety management classes helped me alot, they are trying to sign me off which I do not understand as they said they had put me forward for CBT, but obviously they didn't!!!!
My heart rate races to 110bpm sometimes, I think it also depends on how tired you are, I mean if your really tired it's more of a effort for your body to do anything, You also sound like you are very aware and pre empting situations and thats not good because you cause the heightened levels of anxiety before you even start.
When you are anxious everything tightens up, all the little muscles etc inside are tense, I bet you are sitting reading this your shoulders up and tense, and you didn't even realise it, well when all your insides are all tense nothing can move smoothly, to wind gets trapped and we all know what happens to our vagus nerve! your digestive system is tense and subjected to more levels of adreneline than usual so this also causes irritation of your vagus nerve.
Do you sit whilst eating? and is it huddled on a sofa or up a table? do you get up straight away? are you eating 6 smaller meals rather than 3 larger ones?
All these do really irritate things.
The other day this has nothing to do with palpitations or anything, but my friend up the school said her daughter had head lice so I checked my daughter and she had a few eggs, so treated all the family, but I hadn't had a itchy head before but as soon as my friend mentioned headlice my head started itching - and I had my mum check my hair and I had nothing, so it was all in my head (excuse the pun) - I hope you can see my point, I subconciously did that to myself, making my head itch, it's amazing what you can do to yourself, just through thinking!
Try to relax, I know how difficult that is when you have them. your comment about 110bpm and it not being normal goes to show you are panicking about every little change in your heart, if you heart doesn't do what you think it should be doing you panic, I've been there, I think my heart shouldn't go that fast after climbing stairs, but how do I know, maybe it should, perhaps I was tired, or I have had a particulary stressful week. But I still let it panic and worry me and end up making the whole thing worse.
I wish I could listen to myself sometimes!

Hope you feel better soon
Kath x