So try to look at the positives of his conversation with you. He is stating what is obvious to him. He is explaining that there are people 'worse off'. However. If we took every worse off situation to the nth degree ........ i.e. the situation in Syria where there is constant bombing, no pain relief, no hospitals, water or electricity ........ but that isn't relevant to us in the 1st World. So we can put that to one side in relation to your on-going situation.
If we took more local situations to the nth degree what would that achieve exactly, I wonder what his thought pattern was? We are all aware of most people having difficulties to some degree! but their problems are not ours unless we are well enough to step in to help. One has to be healthy in order to help others.
So taking your situation which is on-going ........ it is what it is. You have support from the Consultant who did the surgery. Pity you don't live closer to the Hospital so that you could pop in when you feel low or un-certain.
So breaking down the problems:
Are your two stoma bags behaving? In general, do they do what they are designed to do?
He is talking rubbish. He knows nowt about depression other than giving a name to a possible condition.
There are at least 2 types of depression. What he is talking about is clinical/situational depression. Where a person is in a dilemma which cannot be altered at that moment in time. So they get depressed and can't see a way to alter things. The other is organic, where the brain doesn't get enough support usually from dopamine and serotonin. These can be treated with anti-depressant medication. Clinical depression may be helped by cognitive behaviour therapy, which didn't work for me as I had been ill since the age of 3 in various degrees. But talking therapy did help: discuss, decide, ditch

.
I have both. The latter is the biggest problem for me and is on the whole, controlled with regular medication. When situations happen out of my control the depression is worse. Plus anxiety kicks in big time

. Then I up my daily medication by 5mg or if necessary 10mg for a week. My GP is aware that I self medicate in order to remain well.
What would you like to 'cure' ?