SOrry if this is a bit grim - On advise I have found here I have stuck a tampon up me with some natural yoghut on I am on a diet and could do without those extra calories!!). How long do I have to leave it up there for? When I do change it do I just stick another one up there like I would do if I had a period?? Oh and also do I have to smuther it around the outside area as well??