Dark fluid in ears, now coughing & sneezing

Hi. I wanted to get some advice about one of my dogs. It is the weekend so my vet's office is closed. Beginning a couple of days ago, Shadow started shaking his head (ears), constantly, and I realized he has a lot of dark colored fluid in his ear. I have been using a vinegar/water solution to flush the ear and provide him some relief. I have now purchased some Vet's Best Ear Relief and started using that to try to dry up the fluid.Today, he has started sneezing and coughing. He is eating and drinking but is laying around a lot. I will probably be taking him to the vet on Monday but wondered if there is anything I can do, until then, to help with the coughing and sneezing. Your help would be greatly appreciated.

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