First of all, take a deep breath and relax.
Maybe your ds is feeling your tension about you going back to work!.
When my dd screams as she is going down for a nap I try to remember to relax, I know it is a lot easier said than done, but I noticed that the more irritated I became so did she, take each day as it comes that way yyour goals for what you want to do are smaller and seem more obtainable.
HTH, I have to run, chaos is taking over my house, keep posting if you need more ideas.