It is possible the stress of being kenneled has triggered a health issue. She is a senior dog for her mix so I'd say you've given it plenty of time to resolve after the boarding and now would be a good time to run blood work to check for health issues, test for tick carried diseases which can cause joint and muscle pain, look for arthritis issues etc.
You can read about acepromazine here
http://www.petplace.com/drug-library/acepromazine-promace-aceproject/page1.aspx
just close any pop ups and scroll down the whole page for all the info on that med.
For storm phobia you may want to use melatonin and ask your vet about using that with your dog. You can read about its use here
http://www.canine-epilepsy-guardian-angels.com/melatonin.htm
it was discovered to help dogs with noise phobias at the Tufts Behavior Clinic.
Hope this helps you!
So the processing of blood work may help indicate why she is shedding so excessively also?
Yes as any time you have an illness and particularly one that is impacting nutriton intake the coat and skin can be impacted.
Some dogs shed just from stress too! and illness can bring on stress.
Dog Expert:Rescue, Train,Breed,Care
30+ yrs dog home vet care & nursing, rescue, behavior&training, responsible show breeding, genetics