Welcome Tom,
I had base of tonugue tumor and neck nodes as well. I went through over 40 radiation treatments with a small amount of chemo thrown in. I too, have had the feeding tube since about 3 weeks after radiation began. I finished radiation around September 6th and experienced similar feelings as you. Once I got home I got very depressed and sort of freaked out. I sought out counselling...there are a lot of free counselling services from cancercare and others. Then I started taking a nice long walk every day and that really helped me.
I have been out of treatment for approximately 9 weeks and I still totally depend on my PEG. I have been trying to eat a little but I find it very difficult to get much down. In the beginning my expectations were that I would be rid of the PEG in 2 months, but I have learned here that for many people it takes much longer than that. So I am trying to be patient about it and am at least happy that I have the PEG, because if I had to depend on eating, I would be wasting away.
You sound like you are on the right road, and coming here is a big help.
I hope that this was at least somewhat enlightening.

Danny