Your treatment plan doesn't make sense to me (but I am not a doctor). Cisplatin is an adjunct to radiation therapy and is usually started concurrently with the first radiation treatment. It is then usually given every third week of treatment. I don't believe that it has much benefit without radiation.
By "get it wet" what do you mean? If it is a surgical incision I would get clearance from the doctor first. If the skin is intact I don't see why showers would be a problem.
I don't understand what "the left next area" means either. If I am reading you correctly you originally had an occult tumor but now they feel your left tonsil is the primary - then where is the secondary specifically? What is your TMN? I'm not trying to pry, but we could help you more with a little more specific information. It is really vital that good notes are taken at all of your appointments. Many critical decisions will hinge on them. My wife faithfully transcribed every word the doctor said so I could analyze it later when I wasn't quite so freaked out.
Stage IV is very serious business, as Kirk suggested, I would accept nothing less than a comprehensive cancer center. At the very least I would be getting a second opinion from one.
We are lucky to be in California - there are many to choose from here.
Here is a list of them:
http://cis.nci.nih.gov/fact/1_2.htm