Ds1 is 3.6 and has been swimming and had swimming lessons before, but has had a bit of an enforced break due to us moving house and the arrival of his baby brother. He did lessons last term where dh went into the water with him, and was fine. However this term he is expected to go in on his own (this was a bit of a surprise to dh who turned up poolside in his trunks ). So the first week dh was allowed to spend some time in the water with him. The second week ds went in on his own and basically cried most of the time, clung to the instructor, but was oddly positive about it when we chatted afterwards. Last week he couldn't go as was unwell. He is due to go again tomorrow and burst into tears as soon as I mentioned that he was going swimming tomorrow.
He says he is "scared of the children" (there are only 2 other apparently very nice ones), "scared of falling out of the swimming pool" (not sure what that means) and scared of not seeing me and his dad (there is a viewing gallery but it's quite far away and I don't think he could spot us).
I don't know how best to approach this. Does anyone have any tips for helping him?