Hello Jade and thanks for the query
The symptoms of ringing sensation in the ear with dizziness
and mild headache can be due to the infection in the ear. If you have any hearing loss
or discharge from the ear than you must consult your ENT specialist
and get treated.
As per the rapid heart rate
is concerned it may be due to the stress or anxiety
you are having, Relax your mind by doing exercise, yoga or medication. Developing good hobbies like reading books, watching TV can help you. Needs to be investigated for other causes related to heart like AF or PSVT. A EKG at the time of episode or 24 hrs holter study can help you to get to a diagnosis.
Best Wishes and get well soon