Things may get better when DD is big enough to (I don't want to use the word fight but it is Sunday evening and the best I can do ATM) fight back in a way that your DS can't get away with it and he may realise it is time to share. My DD2 went through extreme clingyness around the age of 11months to 13 months. Made it very hard at Christmas time when everyone wanted to have some of her attention. I hope it eases for you soon.
Also, before DD2 could crawl or walk we would always ask DD1 to get her a toy when she was getting one for herself and give it to her. This could be something you could try as a way of showing sharing.
The only answer I have for you is to do nothing. By that I mean, don't worry about the house work, cooking gormet food, trying to be super mum. When both want to be picked up, sit on the floor instead. When DS can't share, noone gets to play with the toys, so I will ask DS1 which toy DS2 can play with and reluctently one will be shared. I have found counting to 3 very helpful, these days I only have to count to 1 before I get the response I want. As DS1 knows her will end up in his room. hope this helps you.
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