It's Monday afternoon; have just finished my first *shift* of work for the day, have to go back this evening... tired already! Anyone else?

Of course Pearl... that's perfectly understandable.. we all would feel the same way in your position. ...  You are right, I am very lucky but my job is very, very difficult in that a) it's a bit like a split shift in that I work all day, come home for a while then have to go back and work all evening until 9.45pm and I get home at 10pm... so really there is no time for me, no time to do anything but the very, very basics, so I get to spend all weekend on housework as I don't get to do it in the week.. I am also studying a course and have a family with 4 children with disabilities...  So yes, I am lucky but it's sure not easy... and b) yes my job's great but you are permanently on show, you always have to smile and be helpful, even if you are dog tired... 
I think sometimes humans are funny creatures... we all  always want what we dont have... I  so loved the time when I didn't have to work..