Dog with Chronic Nasal Discharge

My 14 year old black lab had surgery for laryngeal paralysis 5 months ago due to a collapsed larynx. AFter that she was not able to bark anymore (she tries, but we can barely hear the sound). About 3 months ago she started with a clear discharge from right nostril. Since that time, she has become more congested; the right nostril has intermittent congestion - always either clear or light yellow/greenish and has recently started with nosebleeds (bright red). Recently has had a nosebleed every other day for past week. I am giving her arnica at 30C, but not sure if it is working. (how would I know; how frequently to give her the med, etc) A few weeks ago the left nostril also started with clear discharge, and now has become light yellow/sometimes very light greenish color. Symptoms are worse when she gets up in the morning and is very congested. These symptoms also continue during the day intermittently. She also has hind end weakness and is arthritic. For the past several years has had eye discharge. She has always been a sweet loving dog; not aggressive; fearful at times, especially thunderstorms. Although her hearing is not as good as it used to be, so I am not sure if that affects her now. One other thing, she started eating the dirt from my plants in the house a few months ago, so I covered them with foil so that she could not eat the dirt. We feed her 3 times a day - dry natural dog food and frozen raw, with a few scraps of chicken or salmon. She drinks alot of water and seems to be drinking more lately. Please let me know if you need any additional info. I appreciate any suggestions or help that you can give me.