the medicines (biaxin and flagyl) that you have been on are actually neurotoxins... http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3175508/
I am so glad you wrote what you did, as I have been prescribed with those and am a little concerned about the side effects. I was prescribed for the treatment of H Pylori, however, as these are the first-line, conventional antiiotic choices (if one is allergic to amoxcilin, which I am).
I read on the Helico.com forum that others have had depression and insomnia while taking the antibiotics. Before taking them, I am gearing up with probiotics and a lot of alt. therapies, which could help with the side effects of the antibiotics, such as Reservatrol, Green Tea, Licorice Root, honey, Propolis, Protiobitcs (Bifidobacterium, Lactobacillus Acidophilus, Lactobacillus Casei, Bacillus Subtilis, Weisella Confusa), pea protein (bioactive peptides), Polysaccharides (Fucoidan, Spirulina, Chlorella, Black Currant, Green Tea, Panax Ginseng). Also, as no alcohol (hence, no Bach Flower Remedies allowed, I have ordered some good chinese herbs, such as Pearl Shen and Super Adaptogen from Dragon Herbs. Ashwandgra is also good. And, Rhodiola.
As a neurotoxin, Biaxin can cause damage to the cochlea, which can affect hearing, balance and cause tinnitus. Taking antioxidants can help prevent this. :)
Hope you feel better on your new combination. :)