4-6 tablespoons of cinnamon 4 times a day ? Sorry to sound so astonished, but that is an extraordinary amount, and I don't know how you could even tolerate that strength of flavour to be honest. Your doctor knows the quantity you were having?
Well, its the Coumarin, as you will know, that causes the problem. Look, I dont think anybody here can give you an answer on this. If there is a medical problem from that quantity then only your doctor can do the necessary tests needed to ascertain any liver or kidney function changes. If you are feeling really unwell, have the pain and the symptoms you say, then maybe its time to get yourself back there for more checks.
I'm sorry I can't be more help than that.
I'm also not trying to worry you to be honest, but I am presuming your doctor has generally checked you over physically and feels the concerns you have are unfounded?