Hi Brenda5
Goodness, you are having bad run. Did you tell your psychiatrist about the side-effects ? He/she may try something different for you. A letter for Centrelink would come after he/she has seen you for some time - may be worth waiting for.
If one has been self-employed (i.e. your renovating houses) it is always harder with Centrelink for some reason. I have been a self-funded retiree (from savings for the future which are now gone !) and am still struggling with them. Any dollars in the bank at all and it has to be spent - nothing like keeping some aside to pay one's bills.
You are in our thoughts as we have all had some or all of your issues to deal with and hope there is light at the end of your tunnel.
Kind regards Summer :-)