@jennythelib - I went through something similar. My husband and I both needed treatment for gingivitis after we went a couple of years without seeing a dentist. (We had moved a couple of times, didn't have dental insurance, etc.)
I've always used regular floss and just had to adjust my technique. My husband hadn't been flossing at all because he couldn't reach between his teeth. The hygienist said that a lot of men have that problem because of their thick fingers. Some are happy with those disposable flossers, but my husband like the Reach Access.
They sell it with the floss - it looks a little like a toothbrush handle with a flosser head instead of a toothbrush head. The handle is reusable and you have to buy new flosser heads. It is the most expensive option; floss is the cheapest, and disposable flossers are next. But it is much cheaper than gum disease! Definitely worth it.