Hi Penpen,
I feel for you. Don't lose heart but look at the MPhil as a stepping stone to your ultimate goal for the Phd. Take a little time off to recover and do something nice for yourself. You are not defined by committees and supervisors. Don't let anybody demotivate you and keep you from your dreams. I know it must be so devastating for you-I cannot be in your shoes, only you can be your own best friend and focus on your goal. You will get there, just persist, one step at a time. If that is doing your M.phil for now, then do it and with panache:). maybe explore other options? You may come up with something much better.
Good luck!