Everyone responds to chemorads differently. There have been ladies here who have spent a large chunk of the six weeks of chemorads asleep, and others who carried on working throughout! Most of us end up somewhere in the middle.
1&2. You can go alone to chemo or take a friend. It's up to you. You'll be there for about six hours, so take a book, puzzles, some snacks/lunch, something to drink. (They'll have water & cordial but you might like your own thing too.) Take a shawl or something to cover your arm up while you are having the IV infusion, it does get draughty! There'll be other people there having chemo too, some might even be on a similar regime to you & you may find some allies! The chemo day is a long day, but I personally didn't find it particularly tiring. If you have a long journey to get there and back though, that could make it an even longer day & perhaps more tiring. Some ladies have children & families or other caring responsibilities before they leave and after they get back, which could make things harder.
3. I didn't feel tired at all in the first two weeks, but by week three I found that I was needing to sleep during the daytime which was a surprise. Don't fight it. If your body says 'sleep' and nobody depends on you to stay alive for the next hour, then you should sleep. It didn't interfere with my nighttime sleeping at all, I obviously needed it! Housework, chores etc can all wait!
4&5. Your chemo & radio plan will be unique to you. I would have my chemo and when the active chemo had been flushed through, the nurses would ring down to radiotherapy and they would try to fit me in fairly quickly. (Everything was based in the same building.) Optimal treatment involves giving the radiotherapy within a certain number of hours of receiving the cisplatin, I don't think it matters whether that's before or after. You'll have chemo once a week and radiotherapy Mon-Fri daily. You go into radiotherapy treatment on your own, but my husband or a friend would sometimes come with me and wait in the waiting room. You may be asked to empty your bowels with a small enema before the radiotherapy (in a nearby bathroom I hasten to add!), as well as drink enough water to have a full bladder. (It helps them see what's what for the treatment, keeping your bowel out of the way.)
Top Tip! If you are coming to radiotherapy on your own and you have to travel far, it would be worth your while checking out where there are available bathroom stops on the way there and back. You may not need them, especially in the first couple of weeks but by week three, quite a few ladies find themselves needing to use them and it will save you a lot of stress having that information before you do need them!