Hello @goodoldboy68, Thank you for your post. I apologize for the lack of communication on my end. Also, I'm so sorry to hear you were in an auto accident that left you with the thumping you are experiencing in your ear.
Next, I need to make you aware that I am not a medical professional and our guidelines state that Mayo Clinic Connect does not offer medical advice.
I think advocating for yourself in the sense that finding an answer to your problem seems to be a top priority for you. Here is the link to the appointment line at Mayo Clinic if you are indeed wanting to make an appointment. http://mayocl.in/1mtmR63.
You mentioned above that you have seen a medical professional in the past- What did they say about the thumping? Do you notice it get louder or more frequent and bothersome with exertion?