Hi! Please don’t blame yourself; you weren’t to know what was wrong, and going to a chiropractor probably seemed an obvious thing to try! It sounds as if he was partly to blame, not you…it is possible for a styloid process to snap, so this potentially could’ve happened when he twisted your neck. I believe that in the US chiropractors are trained doctors but here in the UK they aren’t. The steroid injection won’t have calcified anything, usually steroid injections help with inflammation, the calcification is often a response to injury/ trauma and inflammation& builds up over time.
Certainly if you read the post about common symptoms & possible explanations:
ES Information: Common Symptoms And Possible Explanations For Them - Welcome / Newbies Guide to Eagle Syndrome - Living with Eagle
then you’ll see that you do have quite a few ‘typical’ ES symptoms- the trouble swallowing & feeling of a lump in your throat are the most well known ES symptoms, along with pain & trouble turning your head, and nerve pain, plus pain eating and talking. The glossopharyngeal nerve can be affected which can cause numb tongue, other members have noticed either hyper salivation or thick saliva or a dry mouth. The strangled feeling is often from calcified stylo-hyoid ligaments compressing nerves. Dizziness, floating feeling, brain fog and headaches can be vascular symptoms, and the heavy head feeling could possibly be instability of the neck vertebra.
So I would suggest trying to get a head and neck CT, if possible with contrast as this would show compression of any blood vessels hopefully. And try to get a referral to one of the doctors on our list if you haven’t already ; Mr Hughes in London or Mr Axon in Cambridge if you can, otherwise I don’t know if any of the Otolaryngologists at the Sir John Radcliff hospital would be familiar with ES?
If you’re not on the nerve pain medication now, I would try going back on this, it can take a while to build up in your system so worth persevering with. Ice &/or heat can help, and sleeping propped up might help too.
I hope that you’re able to get diagnosed & some help! 
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