If by PT, you mean physical therapist, my first suggestion is that you report this person for dereliction of duty and get someone else.
I have had 4 back surgeries, including cervical spine fusion. In each instance, I was put under the care of a phys. therapist who specialized in recovery from whatever surgery I'd just had and who guided me through months of PT (in one case, a full year of it). None of these professionals every told me to do whatever I wanted to do.
So I can't imagine that a therapist told you this. Therefore, my second suggestion is that you ask your neurosurgeon to provide you the documents you need to get physical therapy. In fact, I'm not quite sure why seeing a therapist wasn't part of your doctor's recovery plan.
Surgery of this nature is so highly individualized that I think it might be dangerous for any of us here on SP to offer you suggestions for specific exercises, but I can tell you that you need to be as gentle with yourself as possible throughout whatever recovery routine your doctor provides.
Best of success to you.