I am taking naproxen now along with glucosamine condroitin. I have noticed that if I work out on treadmill and weight machines, I am more or less pain free that night. Sounds to me like the person asking this question has already found something that will lessen pain and maintain fitness. Again, by consulting a specialist in this area, they can be pointed to exercises specifically for the neck and spine. The buoyancy support of the water decreases the compression stresses on the weight bearing joints and bones and muscles in the legs.
Most people can exercise in the water with minimal muscle soreness.
The possibility of injury is almost eliminated. Blood circulation is increased. The resistance of the water also makes exercising a bit of a challenging type of activity so you can strengthen faster. From the mental aspect, also, it's great for a general feeling of well being. Certification, for healthcare professionals like myself, is generally new.