"I think that we all need to send Jack soothing suggestions and
ideas to reduce blood pressure, etc."

  I heartily recommend Rescue Remedy.  Tried it recently, myself.
I must not have been stressed enough, cause it put me out cold.  But it was the best eight hour sleep I ever got in 2 hours.  The two moms I have had try it, plus several friends, find it greatly eases their agitation, not only at the given moment, but over a period of time as well. 

 And thank you once again, Kathleens, for Lactnet, without which I would never have learned of this solution -- not to mention all the other approaches and solutions to problems that get discussed here.

Chanita, San Francisco