Thanks for all your info, his screaming was what he normally does at about 10pm everynight, playing whith his toys and getting all crazy, so that was very normal.He has just eaten. He then just sort vomited/reguritated and that was it. Then carried on as normal, I called the vet and he told me not to worry, just watch his poop and any other changes. He is feeding fine and active as normal...so I will wait today and see what happens.