Hi Grifmat,
You know when your mother has such a severe crisis reaction with depression and very high anxiety level she should have professional help. Don't they offer psychological support in the clinic where she now is treated?
http://www.cancer.gov/cancertopics/p...ession/Patient
I googled antidepressants and sedative drugs but couldn't find any drug without low platelets as a very uncommon adverse event.
Hope your mother will start to feel calmer!
Kind regards
Birgitta-A