Brilliant news! Just have to share!
I went to meet my new GP today and he gave me the results of the blood test that I had done last week. My CA125 is 6, (anything up to 30 is 'normal') my diabetes is well under control and I have had my original statin restored to get better control over my cholesterol. He advises me to go on pushing myself a little physically too! Aparently it takes more than a year to recover from major surgery, hence the tiredness, but I am advised to try a bit more cycling and walking a bit further.
I am now not expecting any unpleasant surprises on Thursday. Theatre again tonight!