K.,
To start I can't abide Destin, it sticks to the skin while you are putting it on & pulls so that the poor kid hurts more!
I would call the Doc & get him in, if he continues to have this he will be dehydrated very quickly...take his little arm between the wrist & elbow, gently pull the skin up & then let go, if the skin just smooths down slowly & looks just as it did prior to pulling it up the dehydration has not started, however if the skin isn't 'plump' and kind of drops down quickly & looks papery and/or wrinkled when it returns to the arm then he is dehydrated in which case it becomes IMPORTANT that he see someone NOW!
Medicaid recognizes true sickness, the rules & regulations that they send you try to get people from abusing the system by going to urgent care or the ER for non emergencies, so don't hesitate to go to these if you feel your child is becoming dehydrated. I would take him on the 3rd day, children & older folks get dehydrated very quickly.
There is an 'old wives remedy' for diarrhea, boil the milk & cool it down (room temp) before giving it to your child. I have never used it but my Granma told me about it years ago...
I hope he feels better soon!