@Jcb Our issues sound similar! I can turn off the high pitch tone with repositioning my head, but only when I'm lying down. I've been doing daily neck/shoulder exercises for the past 1.5 months. Here's my routine:
CERVICAL SPINE - 48 Neck Extension On all fours, head lowered, slowly raise head and jut chin. Repeat 15 times per set. Do 2 sets per session. Do 3 sessions per day. CERVICAL SPINE - 1 AROM: Neck Rotation Turn head slowly to look over one shoulder, then the other. Hold each position 5 seconds. Repeat 8 times per set. Do 2 sets per session. Do 2 sessions per day. NECK - 9 Side Benders Gently grasp side of head with one hand, placing the other hand behind back. Tilt head away until a gentle stretch is felt. Hold 30 seconds. Repeat to other side. Repeat 2 times. Do 2 sessions per day. SPINAL MOBILIZATION - 9 Upper Cervical Extension (Sitting) With hands clasped firmly behind neck, gently bend head back. Do not allow movement under or below hands. Hold 3 seconds. Relax. Repeat 15 times per set. Do 1 sets per session. Do 6 sessions per day. SHOULDER - 100 Scapular Retraction (Prone) Lie with arms above head. Pinch shoulder blades together. Repeat 12 times per set. Do 2 sets per session. Do 2 sessions per day. SHOULDER - 107 Scapular Retraction: Abduction (Prone) Lie with upper arms straight out from sides, elbows bent to 90°. Pinch shoulder blades together and raise arms a few inches from floor. Repeat 15 times per set. Do 2 sets per session. Do 2 sessions per day