I'm so sorry that you are going through this - I know how horrible it is. I echo the recommendations of those above to just spend as much time close to each other as you can. Hold him and tell him how much you love him == and how much you will miss him. Sending you prayers and blessings of peace. Hold on = caregiving is one of the most difficult and certainly the most painful job there is!!
God bless you and your family.

Bonnie

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Caregiver daughter Teri, age 43, mother of three, non-smoker, non-drinker, aerobics instructor, SCC 4/06 SCC lateral tongue, partial glossectomy, mod rad neck dissection, 35 IMRT; metastatic return 4/08 to lung, bone, kidney. 10 additional radiation to lung, 3 Docetaxel + Carbo, lost her battle on 9/29/08