Good Morning nanase!
Welcome! Were glad you started a new thread, and got an introduction in of yourself!
Im not sure what the acdf stands for, and am guessing it is a cervical fusion at the c5/c6? Please remember your surgery is considered very fresh, and it takes quite some time to heal, especially the swelling of all the tissue that was disturbed during the surgery.
It is common place to worry, because we have our expectations set pretty high going into the surgeries...and of course we are putting faith into the professionals recommending it as well.
Many of us have had the spinal surgeries, and trust me it takes time. PT may make it even more sore for a while, but it is needed to get things back into shape. Are you still on pain med's? Don't cut yourself short on them...they are there for a reason. Give it a few more weeks, and then see where you are at with it.
I'm glad you joined us...now keep checking in for support....we will be here for you.