I know how you are feeling and wish your little one well. When I got up this morning at about 7.30 a little later than normal my Jessica was lying on the landing looking quite peaceful, but somehow I knew all was not well. I picked her up and tried to stand her up and she just fell down again, I then took her downstairs and as I placed her on the kitchen floor she made the most frightening noises and was thrashing around all over ( I have over the years seen many cats have fits but nothing like this) I phoned my vet immediately (fortunately I have his mobile and home number for such emergencies) and he said to meet him at the surgery. She is now in the hospital and I am waiting for further news