In answer to your question, ringing in the ears is a side effect of Hydrocodone, though it is one of the "less common" side effects of the combo of Hydrocodone and Tylenol.
One of the problems with this combo, if a person does not take meds as directed, or abuses the medication, can be far worse than ringing..it can actually lead to deafness. A very public radio figure recently underwent a Coclear Implant so that they could continue with their very popular daily radio program, after being busted for prescription drug abuse, and then a short stint in rehab.
This is one of the reasons in addition to Liver Toxicity that it is recommended that no more than 3000 mg/per day for daily users, such as us CP'ers, and 4000 mg/day for other users of Tylenol. Hydrocodone alone has no ceiling mg/day if I am correct. It's when combined with APAP that it becomes toxic to our body & organs.
If you have pressure in your ears as you described, more than likely it has something to do with sinus congestion/fluid in the ears, as opposed to something connected with the medications.
Just wanted to make you aware of the information though. By no means am I suggesting you are not taking your meds as directed, or that you are abusing them....just making generalizations about what happens to people who DO. Don't want you to mis-understand my reason for posting.
Hope the pressure in your ears eases up soon. I actually have both vertigo and tinnitus, and it's not fun. The ringing in the ears alone can make one go nuts. Mine is the result of powerful antibiotics that were given to me while hospitalized. It was either take the antibiotics, or risk dying!
The antibiotics literally fried the villi (hairs) in the ear that carry sound, and those don't regenerate. As such, I lost a TON of hearing (about 55 dB) in that ear, and it discolored my teeth terribly also...they are sortof a grayish color. Weird...but at least I'm alive...right??? LOL
Hoping you feel better soon!