Dog Heartworm Treatment

She’s been scooting. I know that can be anal sacs needing drained. The vet did that a couple weeks ago, and said really they didn’t even need it.
The dog was still scooting when she got home. I also had a worm test done, and it came back negative. Sometimes she eats grass too, which I know can be a sign of stomach issues. She vomits once and a while too. I’m going to have another vet look at her, just wondered if anyone had any natural remedies or if it sounded like anything in particular. It cost me around $400 last time I had this checked (2 weeks ago) and it will be another month before I can afford that again. I’ve tried cleaning the area with vinegar which helps some.