Hi Humphry... it certainly is a hard situation isnt it?
I had to put my son into daycare two days a week this year as I was starting Uni.
Well the first week was a shocker for him... I was convinced that I was going to have to pull out of my course, as he just wasnt handling it very well. They would call me to come and pick him up before midday as he was just so upset, and they didnt want his experience to be so bad that it would make it harder for him to adjust iykwim?
But as time went on Aidyn has adjusted sooo well to going. At first he would still cry when I dropped him off, but even after a couple of weeks he stopped doing that!

How old is your DS? Sorry if I missed it somewhere...
Aidyn was 20 months when he started. He has also always been a very shy and clingy baby too...

Do you know if the carers at the daycare make a real effort to distract him? Such as by reading stories to him, or doing drawing/paintings, or blowing bubbles? I know Aidyn LOVES doing this stuff, and his daycare always have heaps of activities like this planned for the kiddies, which makes their time there so much more enjoyable.

I truly hope that this week things are bit easier for your DS in the occasional care... Please let us know how things are going!