I'm with some medical aid underwritten by Medscheme. I know it's pretty comprehensive, unfortunately not very cheap (But my work pays half) and there is a portion for psychiatric stuff too. Check the web for info on PMB - I'm sure all aspects of BP need to be covered and NOT just the meds.
Then also speak to a lawyer or your pdoc - my T mentioned that when my psych benefit runs out, she can write a motivational letter to transfer funds from another part of my benefits. And right now she knows I need T!! I could never afford it without medical aid tho