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Thanks everyone. Its just so intermittent and I am a creature of habit. I am a fussy eater so dont try new stuff often, I use non-bio washing powder, different shoes depending on weather etc. Redcrx - not blisters, just swollen lumps that hurt to walk on. Rojash - don't think its HFM as looked it up and my symptoms are different. I am taking medication in the form of Lansoprazole for acid-reflux and Citalopram for depression but have been on both these for a fair while now.
My feet suffer the worst and it can last for 3-4 days.When I got it on my thumb the other day, the next day my hand felt tender to the touch, a bit like a few years ago when I had a needle put in the back of my hand and caught an infection - stingy and sore. I have been keeping a diary of what, when, etc and am going back to my GP at some point armed and ready.
Thanks everyone again.