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Hi. My name is***** I'm very sorry to hear about this situation with your little one. I'm going to be honest here and say that from an at home aspect, this is something that isn't going to help him. He needs to be seen by your vet. If he's been vomiting every day for a week now and is losing weight, then the concern for a blockage in his intestinal tract / stomach is very, very high. This is something that your vet can do some testing to see if this is present. If it is, then surgery is most likely needed. I can't say that there is really anything at home to do except to get him to your vet as soon as possible as he most likely will continue to do this and get weaker and weaker.