Gosh.  That's a lot to cope with.  So glad you're feeling well.

I was always glad when my cancer marker score came down and at each check-up I used it to reassure myself that I was staying well.  I would imagine the CT scan should cover both.  At one point they thought my cancer may have spread to the bowel and they used the C.T. scan in exactly the same way. Though I don't know about bowel cancer, I can say that I had many follow-up CT scans for my ovarian cancer.  Though they are necessary, the waiting for results can be very stressful.  Not sure what you're doing to cope with all this but I literally took one day at a time.  I would wake up each morning and whilst in the shower I would say to myself "Well, nothing bad is going to happen to me today" and then just allowed myself to get on with the day. 

Losing your hair during chemo is quite disturbing, isn't it?!  It doesn't take too long to grow back though - so don't worry.  Not sure if you're using a wig.  I did for a while and then decided I had nothing to be embarassed about and took it off.  It was quite liberating!  When it grew back - I had very curly hair for a while!