I just had to comment when I read your post! I have always been against Pets at Home and have vowed never to get any animal from there. However last week I was in there getting something with niece and fell in love with a syrian, so had to get her.
She is now currently VERY ill and probably wont make it through the night
She caught wet tail from other hamsters in her tank, whilst at Pets at Home. Bloomin Pets at Home are useless and shouldn't be allowed to sell animals as they have no idea how to look after them.
I am very emotional about Pets at Home, especially now Veronica is ill.
I really hope you have some better luck... although its all Pets at Home's fault, not yours. Go to a breeder to get your next hamster and I'm sure you will have a healthy hamster who lasts for years.