Chemoradiotherapy

Can anyone give me any kind of reassurance?  I’m feeling really desperate.  Had my first chemo treatment of Cisplatin last Monday and now can’t face food or drink even on day 5.  I feel really panicky, ghastly and depressed.  Also started radiotherapy on the same day and somehow managed to get there this week.  Has anyone had these awful side effects and how long will they last.  Any advice or reassurance would really help.