My son is 2 years old and in the last week has become a terrible cling…

My son is 2 years old and in the last week has become a terrible clingy baby and constantly wants me on his hands. He throws tantrums, lies on the floor and cries until I pick him up exactly. My back is falling apart considering that I'm still holding the youngest one on my arms. Is this a period or is he jealous of me? He used to leave it alone, left him with a nanny and with parents, there were no tantrums.