It's the first one that I know of - or at least witnessed - and it was horrid feeling so helpless. Thanks to a friend who has a cat who has regular fits I knew what was going on and what to expect; and I contacted her straight away to check what to expect next.
My worry is that Molly will be 21 in about May (or June) so she's a really old girl - so I don't know how her heart would cope if she had more? I've got a vet appointment for her on Saturday anyway, so fingers crossed she has no more fits between now and then. But if she does then I I'm going to have to give her quality of life some really serious thought For her age she's otherwise quite OK - eats, sleeps, pee's and poo's as she should and besides chronic arthritis and age related kidney issues she's been fine so far.