I had a TURBT about 6 weeks ago, although I'm not having follow up chemo. 

I, too, am feeling quite fatigued and often find it difficult to stop dropping off to sleep. I assume this is a result of the powerful drugs that are used to induce anaesthesia; there are certainly plenty of references to fatigue after surgery.

You should have been given a nursing contact (sometimes called a Macmillan nurse), and you should feel free to contact him or her at any time with any worries.  I think you need to phone and leave a message.