How To Overcome The Respiratory Virus And Fluid In The Inner Ear?

I am a 41 year old white male who exercises prodigiously - marathoner, etc. Approximately 2 months ago I started lightheaded, dizzy spells which I attributed to an upper respiratory virus and fluid in the inner ear. It failed to resolve after 3 weeks so my gp prescribed azythromycin. This seemed to work on the respiratory/sinus problem but I still had the dizziness. I went back to my gp and he instructed me to take a otc antihistamine to dry things up. I took two days worth and during this time I received a flu shot, which I get every year and have never had a bad reaction. The day after the flu shot I felt awful and unlike I ever felt before. Nothing specific just rotten. The next day was fine and I exercised as normal, etc. The day after that I did so cardio in the morning and that evening at I wedding the awful feeling return more intense. So much so that I thought I would pass out. My wife took me to the ER. The ran an ekg, blood and urine and found nothing. The did check my thyroid, too. After about 2 hours I was released to follow-up with my gp. They are running more blood work and I am due to have a stress test this week. The one symptom I have not relayed to them because I thought it was simply musclular pain was I am experience random painful pulse-like pains in my left, lower abdomen/pelvic area. I have not taken any meds/vitamins/supplements for a week. I am on no medication. My pulse rate is usually in the 60 s but has been in the 50s. My bp has been lower than normal but not abnormal for my physical condition. Since the ER visit I get these episodes where I am kind of weak, on edge and feel faint. Eating seems to help, though they say I am not diabetic. Thank you in advance for any suggestions...