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Hi Trevor...well, at least I got your answer, so the mail check thing seems to be working. Anyway, I used the word spasm as that is what it felt like - a quick burst, then...but it stays on for seemingly ages, but I won't bother the NHS, as they've got more than enough and much more serious things to be going on with, so I'll just rest when the 'spasm' comes and then just let it get on with itself, then proceed as normal!...whatever that is, but Many Thanks for answering.