Hypothyroidism usually won't show up this quickly. It's a latent problem that can appear as much as a year or 2 down the road. That's why a baseline TSH test should be done prior to Tx and every 6 months post Tx for several years.

Since Cisplatin is an adjunct to radiation I am going to assume that you have had RT. What type you had will have a bearing on future quality of life issues.

Most likely you're suffering from poor nutrition, dehydration, radiation sickness, low RBC & WBC and possibly even a little toxicity from the chemo - typical for this stage of the game. "Whiting out" is perfectly normal.

As far as other surprises, well there's always thrush, constipation, slow healing response, depression, permanent "texturing" in the muscles in the radiation field, etc. Many (me included) feel that the healing process doesn't even start until 3-4 weeks post radiation. Your progress will be measured in three week increments and it takes one month of recovery for each week of radiation.