Had 6 weeks of chemo last autumn and then triple strength 18 weeks this spring/summer (cisplatin every 3 weeks and cetuximab on weeks inbetween for a full day).
Someone mentioned a PEG feeding tube on an earlier reply and this is a great solution. I had one fitted and it was my saviour, as I just didn't want to eat anything.
I lost 2 and a half stone,was admitted to hospital 3 times due to vomiting or low blood counts and had a horrendous rash.But it is doable and I got through it though I did seriously think about quitting treatment at least twice, but then again who wouldn't ?
Keep on fighting - a month after my treatment ended I was eating almost normally.
Also - keep up the water intake and try a few drops of lemon juice in same - it should take some of the metallic taste away.

50 yrs.Non smok.Mod drink.
Tongue canc SCC T2N0M0.
Surg. Jul '11 1/3 rd of tongue rem. & sel. neck diss.PEG fitted.
Aug '11 6 wks chemo/radio.3 more canc. nodes rem.
Feb '12 18 wks chemo.
Nov. '12 Mod rad neck diss on right, & pec flap rep. rem. of tumour under chin. More rad to follow in 2013.
**update** Passed away September 26, 2013