Giving to too many charities at once

I give to a number of charities but I am seriously thinking about reducing the number.
They seem to want more and more each year they say their costs are going up but so are mine and we are on fixed incomes. I am disabled and we are on a pension.
This seems to have no affect when told to them perhaps I should jump on their list LOL. Certain charities help pay outstanding fines etc that people "find they are unable to pay" This is so wrong they should never be given money.
Vouchers or coupons. We see so many TV reports showing how young people and perhaps not so young blatantly tell their stories about how they can live up in Byron Bay on the "Dole"
How can they do this when we have to list every source of income we have and our pension goes up and down even weekly in tune with our assets. The fact that these assets we cannot cash in as the interest from them supply the remainder of our pension.
We thought we had totally covered ourselves for our retirement until the market crashed.
That was the biggest shock of all to find so much money had just disappeared. Now we have to keep Centrelink informed of every change in our financial situation. How do these others manage to get money so easily
One more thing, I said I was disable, it means lots of Drs and hospital visits. We can almost guarantee that after a hospital visit we will receive a request for a Charity at that hospital. Charities are exempt from the "Blocking of unwanted calls"