I think we all have to give each other a sanity check every now and then. Tinnitus is crazy making. At least for me it is. I would be very surprised that your original tinnitus was caused by Kenalog. I've had many, many Kenalog injections and I've never had a problem. And again, as you know, Kenalog is the steroid and they are not known to cause tinnitus. I'm betting your etiology is something different. Perhaps hidden hearing loss, or exposure to loud noise. Damage to your ears is cumulative over the course of our lives. It could've just been that moment that tinnitus started for you due to hidden hearing loss as a result of damage from noise exposure over time. Generally speaking, most people don't realize how much damage they do to their hearing. I certainly had no idea. I can't tell you how many concerts I went to and never considered earplugs. None of us did. It never occurred to any of us the damage we were doing to our ears. Other causes could include problems with your Eustachian tubes or neck and jaw issues. I have major TMJ because I'm a clencher, and I carry all my tension in my jaws. My tinnitus gets louder when I yawn, move my head in certain directions, chew. Super annoying. And then just for kicks and giggles it will just get loud, then get quiet, then get loud again. No rhyme or reason. Ugh.
As for the Dupixent, I love it. About two years ago I developed eczema over about 80% of my body. My head and neck and shoulders were not affected. Pretty much everywhere else was. The type of eczema I had was not the dry scaly kind but the inflammatory kind. I literally had large swaths of skin that were red and highly inflamed. No amount of steroid cream worked. They tried light therapy. That didn't work. No matter how many antihistamines I took I could not control the itching, but the itch from eczema is not a true histamine response so that figures. It got so bad that my skin was actually painful. I couldn't wear regular clothes because I couldn't stand the feel of the clothes on my skin. I finally went back to my dermatologist and I said to her, "Either you do something for me today or you going to read about me being fished out of the Charles River". Clearly I live in Boston. I was beyond miserable. So she actually put me on Cyclosporine initially. It was like a wonder drug. My legs were clear within two days. You probably know it's an immunosuppressant. It's also a really dangerous drug. At the same time she started me on to Dupixent. You have to build up your Dupixent level to be therapeutic so I took two medications at the same time. Finally, I came off the immunosuppressant. I've had great luck with Dupixent, and I've had almost no breakthrough episodes until I had my first COVID-19 vaccination shot.
Dupixent is an injectable and you need to inject every two weeks. I will tell you that it burns when you inject it. It's a spring loaded syringe. My husband actually injects me in the thigh. It's so worth it. Takes maybe a few seconds because they want you to inject slowly. I've had absolutely no side effects, which apart from an allergic reaction, are primarily ocular in nature.
It is very expensive. In the US it's about $39,000 a year. Thankfully my insurance covers it.
Good luck.