Don't think about legal action now, just keep recording everything (don't just leave it up to your shrink) and see how you feel in a year from now. I know you need the money for your sessions but even if you did start immediately the money would never be through in time. In my case the other side didn't deny what had happened but a settlement still took 1.5 years to happen.
How did you feel when Rhianna took back Chris Brown a week after he had beaten her senseless? I imagine you wondered WTF like the rest of the world. I think she said something about missing him and still loving him and I though ARGH!! He beat you!! In your case the doctor didn't hit you but he sure messed you up good and proper.
KEEP RECORDING EVERYTHING!! Every sick day. Every appointment. Every cent you spend that might be caused by him.