What Lila said
. It has been an anxious time for you but it’s getting sorted. You sound to be doing great with your hammy - he likes coming out. Yes sounds like bad dreams- he’ll get over it. They’re like children - the bad bits will be forgotten once he’s having fun again. It’s surprising how a special treat can get them so excited they forget everything as well. Half a walnut does it with mine. Or a whimzee toothbrush chew with sunflower seeds in. He has been treated and hopefully they won’t come back now. Sounds to me like it’s more likely he got them at the pet store.