Hi Mate
Just to add to the already fantastic advice, I work away a lot and occasionally practically live in hotels. Here are the tips that I have picked up:
DON'T attempt the hotel breakfast unless you are very strong willed- I take alpen light bars, pre weighed out bags of cereal (that I can eat like biscuits e.g. weetabix cruncy bran) ryvita and laughing cow and have breakfast in my room
Although you may think hotel breakfasts will be SW friendly they are NOT- when faced with masses of free food only the strongest willed of people can manage- can you face not putting real butter on your toast? Would you be able to not eat all of your cereal as the mini box is more than 28g? Would you be able to resist the sausage and fried bacon when getting your beans? I couldn't, so don't do it to yourself!
For your room- to stave off hunger and help you cope with homesickness, take mugshots and flavoured cous cous in tubs for emergencies as you will have a kettle in your room
Keep lots of free/low syn treats available to avoid hotel boredom eating at night- fruit, ryvita minis, eggs (boil in the kettle), bovril stock for a savoury drink and alpen lights
Good luck
x