Sorry to hear about the difficulties that you have been experiencing.
My first thought is that in order to recommend any potential treatment to help with your problems it is vital to the know the cause of the problems first. Based on your description of things it sounds as though you have some injury to the facial nerve on the left side of your face - given how long it has been since your initial surgery this nerve injury is most likely permanent (there is always some potential for nerve regeneration but you most likely would have seen something by now).
If you do indeed have nerve damage this makes a big difference than if your nerve is working and there is a problem with the muscles or scar tissue build up. This seems like an unlikely scenario since if the nerve was intact you would still have normal movement and tone regardless of muscle attachment to the periosteum and vice versa.
My best advice would be for you to be seen by a board certified facial plastic surgeon who can assess your nerve, muscles and anatomy and determine the exact nature of your problems. From there you can have reasonable and appropriate options to help with your concerns.
Best of luck to you