Is my mental health part of the recovery process?

Having had five operations in the last five months and now being back to where I was four months ago I have been feeling a little low.
 I would not say I am depressed but I am not my usually jolly self and tears flow a lot more easily than they ever have before.
I have now mentioned to a number of different health care professionals that I come into contact with that I am feeling sad, and this has been greated by such wisdom as:
'Yes a lot of patients feel low after surgery.'
'Well we knew i...