Ears are ringing, feel anxiety or weak, head feels full of something

I am a fit 45 year old male. Exercise regularly. Non smoker and drinker. Clean as a whistle minus IBS. Do not drink coffee and eat extremely healthy and watch my weight. I am 5'11 205 pounds. Had my blood checked all came back fine. My ears are ringing, at times I feel anxiety or weak, my head feels full of something at times and when I yawn my ears crackle at times. Any suggestions what I may have. What is suggested to correct the problem. I visit the ENT on Tuesday.