M.H.
Well, just hold him then. Seperation anxiety at 6 months is a crock, I think. Invest in a sling. What is wrong with a baby wanting to be held by his mother? I just got used to my koala bear in the mornings being needy (still is) and when he is ready, he asks to be put down, and now he is off and running on his own. My other family members could take him away from me with no crying from my baby... but the day care? NO WAY. So we got a nanny, and now that part is 100% better. He didn't like the day care. Turns out he didn't like chaotic environments, and it was too loud and too lonely there for him. He is not colicky and several professionals have observed him and there is NO clinical seperation anxiety. Simply a baby that wants to be held. I bought a Sakura Bloom sling and wore him all the time. The sling was beautiful and comfortable and he loves it, and I loved having him close to me. When he got happier... he slept a lot better too. In fact, he now sleeps better for the anny than he does for me!
The only way babies can communicate is to cry - so he is just trying to tell you he needs you. He's just a baby.