Here's hoping that you are fully back to normal by the time you fly. I agree with others who have said if you have upper respiratory symptoms at the time of the proposed flight, don't do it!
From the tinnitus point of view,all would probably fine, any increase in tinnitus settling quite quickly. On the plane you may not notice tinnitus at all. Earplugs designed for flying should help.
Why am I bothering to reply on this thread, saying things that others have already said. Well, I'm not a 'doom-monger' by nature, and feel that most things in life can be handled. I also think that we are all a little different, and some of us probably are born with narrow Eustachian tubes which will cause more trouble than the nice wide type.
I was always prone to have some pain on plane descent and would Valsalva furiously for about 20 minutes. After a flight, my ears would remain a bit 'iffy' for a number of days.Still, loved to travel and put up with the inconvenience of the ears.
Some years ago, whilst in India, I developed a heavy cold about a week prior to flying. The cold had cleared, no ear symptoms, and I gave it no thought on boarding the plane. 8 hours later, and descending into the airport, I developed excruciating pain in my left ear. Unable to 'pop' left ear. Finally, nearing touchdown, my eardrum perforated with a little clear/bloodstained stuff escaping and immediate ear pain relief. the perforation and ear symptoms settled quickly.
30 years later, I developed Eustachian Tube Dysfunction and 24/7 tinnitus/deafness after a VERY trivial cold. First grommets, then T-tubes...but at least I will be able to fly without a problem.
So, I think I probably had narrow E tubes all along, prone to block. If those tubes are still crackling/popping at the time you intend to fly...DON'T.
Pre-treatment with decongestants are said to help, so maybe get some now? I can't take them due to glaucoma, but would do had I been able.
Good Luck.
Fungus.