B.B.
Have you talked to him and told him what you are going to do and then immediately follow up with doing it? You may have to begin small to establish this so he gets the pattern. I always did this with my kids. I tell them "We are going to the health club and you will get to play with other children in the play room." We go there I talk the entire way to the play room about how I will work out and some of the fun things they will do. As we arrive I tell them to look and see and I find something or someone that will catch their attention. Then I say "okay one last hug and then I will go for a little while. I will be back very soon." I put them down and they are confident and off playing. I had already established this routine with everything else too. I talk about things I will do with them or places we will go together. Then we do them and I remind them that we did exactly as I promised. They know I will come back because I always keep them informed....even when they were very young. I looked at it as though they heard me saying (even when they were just a couple of months old) that I am going bye bye, but I will be back soon and they will be okay. When I hear myself say this, I feel more confidence in leaving them and they sense the confidence and then feel it themselves. Only one of my kids had a few times of separation anxiety. It was the way I was handling him in the moment so I worked harder to instill what I had already been working on with them all and the problem resolved very fast. My 3 yr old (who is the one that had separation anxiety around 6 months for 2 weeks and mildly at that) had his 1st bout of this again at preschool the other day. I just told him I cannot stay today, but I sure am flattered that he would like me to and I knwo i would be fun. However it is time for him to be brave and I will go home and be brave and do all I need to do. Then I will return to get him later and we can compare stories. He hugged me big and told me goodbye and had no more trouble at all. It is all in the approach and level of confidence. If you think you will fail to leave them, then you will. This is sort of like a self fulfilling prophecy. Good luck, be confident and I hope you can successfully get your work out in. I am needing to arrange my schedule for this as well.
B. :)