I hope that tomorrow you feel better after some sleep...I am relieved that you have both contacted your son in law and confided in the therapist and she is helping you sooner rather than later.
one thing I believe...He is BLUFFING...because he believes that you WON'T shut off the cable Wi-Fi. he knows it is your lifeline. change your password ,erase your histories daily..i would not doubt he reads your stuff or reads what you have written here. he is desperate and will do desperate things..don't think he will respect your privacy, he won't.
If you lived here we could pet cats and walk Sammy....I just noticed a young kitten outside while walking Sammy, I put him in and ran out with a can of Fancy Feast but he was gone...I think either he belongs to someone or he got dumped...I hope it is the first one.
good night's sleep and do not give him further information, just talk to the therapist and your son in law...(JMHO). hugs too...and from Perry.