OMG i cant stop crying

I had just wrote a thread ''So close'' about bailey an him gettin his hair cut at the groomers 2day and him doing so well with his potty training, so i'm reading through it after i post it when i hear a sucking sound i turn around to look in leahs bed where bailey and leah was sleeping i see bailey he looked like he was trying to bite leahs ear, i said ''Bailey NO'' but he didnt listen i looked closer and his body was all stiff i screamed OMG and picked him up he was all stiff jerking about. He was foaming from the mouth i burst out crying!! I ran with him to the phone an put him on the floor to phone the vet i was frantic by now. he started to come around after like 2 mins he woke up and didnt seem to know where he was. I was crying which did not help at all i just didnt know what to do i thought he was gonna die. He couldnt walk and his head was twitching as he was trying to come round from it.. i have never been more upset an scared in my life!! I took him the vet right away which is a 1min car ride and they said he seemed fine. He has been the groomers 2day so it might have been something in the shampoo which i'm checking out ... or might be his liver so he is going in next week for blood tests

i am so glad he is ok but i dont want to take my eyes off him as am scared it might happen again.. everytime i think about it i start to cry. Has anyone else has this happen . if so what was it, the vet said it might be a one off and i am hoping it is, i am just so scared