Hi,
I'm sure others will correct me if I'm wrong but I am sure he is not deliberately crying for a cuddle/attention.
Could there be the possibility of teeth or an illness? DD is always very "cuddly" when teething or ill. Perhaps he just likes being able to see you. Does he play happily while you are in the same room? Could you put his baby gym etc in whichever room you need to be in so he can see you?
How long has it been going on? Was there something that might have triggered this reaction? Is there anything else fgoing on in your lives, or any big changes that may make him clingy?
HTH
H