Hi, antidepressants tend to take weeks for side effects, head aches etc etc to calm down, if you have only been taking them a short time it could be that? Missing one dose probly wouldn’t be enough to see if it was the meds, if I remember right, after two weeks of side effects not improving, you have to see doctor for advice but they do expect side effects.
There are techniques to not focus on tinnitus, you can buy these little white boxes that make restful sounds, (not sure what they are called sorry) meditation can help, my daughter finds the sound of a fan at night helps, I think you have to find a way to try and ignore it.
It could be a head cold sinus thing lurking. My other daughter has just had an ear infection and she suffered tinnitus for the first time.
I hope you get a useful answer, best of luck.