Poor Max and hope that his prob gets sorted but its not easy.
I have Franta who went through a period of not eating until he was ill this year and the vet tried everything to get him to eat. He is about the same age as Max and is very fussy, moreorless its lick the jelly from felix and eats his biscuits and thats it!
Kocka my first cat refused to eat and would let herself die rather than eat anything she decided she didnt like and she lived on AD diet off my finger for about 3 yaers cos it was the only thing I could guarantee to get into her and she also ate other things she fancied from time to time but it was a nightmare.
I tried all the foods around at the time and had a cupboard stacked with food she had liked once!
My vet said to let her eat anything that she wanted cos to eat is better than not eating.
I would try AD with Max to try and get him eating again and I also found that hi-life turkey and chicken giblets.....its a little tin with yellow on, and is a soft pate type food went down quite well. The others in the series are quite different.
I also resorted to sainsburys pouches and she would like the gravy ones from tesco where she just licked the gravy. In the end she went onto eat whiskers supermeat from tins which was totallt daft as that had been rejected when she ate normally.
Are you sure his teeth are OK?
The shouting is probably hunger and or the start of dementia maybe, Franta is quite shouty too and Kocka suffered from dementia in her last couple of years but she was a moggies and older.
I know Max is a pedigree and I dont know if his bredd is like birmans who on the whole dont live as long as moggies ands other peds.