Heatherr,
Welcome to NeuroTalk. You have found a good place.
Are you being treated by a doctor ? You should tell a neuro about this sudden ringing. You may have a neck injury that causes blood flow changes to your brain when you move your head and neck. There can be plaques that break loose in the vertebral arteries during neck/head movements that can cause sudden symptoms.
Any time you experience sudden changes in consciousness, motor control, sensations, intense head pain, etc. you should seek medical advice. If these changes are extreme, have somebody get you to an Emergency Room right away.
Your cycling puts you at risk. If you experience this same situation while riding, you could suffer a fall into traffic. Please take these symptoms seriously. Don't minimize this injury. It may end up following you for months and years to come. You also need very specialized legal help. Check out
www.tbilaw.com and
www.subtlebraininjury.com for information about the pitfalls of having less than the best legal representation. You strength to compete will not overcome your injuries when they are brain oriented.
My best to you.