I've got ringing in one ear from an inner ear injury (years ago) that's permanent but gets louder when I take any stimulant (nicotine, caffeine, ADD meds, etc.) I also have 4kHz hearing loss so I have background ringing in both ears, sometimes pretty much silent, sometimes very much there. That ringing is also affected by stimulants. As I sit here vaping I have two tones going in my left ear and one in my right. In the morning the ringing will be much quieter until I reach over and grab my morning vape, and gets louder as the day progresses. Just my experience with something similar.
My ringing is due to physical damage to my ears in one way or another. If you didn't undergo a physical trauma (barotrauma from diving, impact to the side of the head, extremely loud noise) when your ringing started, I'd suspect (I'm not a doctor but have done a lot of research due to my own issues) that it's the stimulants directly (or stimulants indirectly via dehydration) causing it.
I'd suggest dropping your caffeine and nic intake some. The results aren't going to be immediate and will last even longer if you're constantly adding to the levels of stimulants in your system. As many others have said, get hydrated - you're doing three things simultaneously that are dehydrating you. Hope everything gets better.