Best ways to treat Bad Ginivitis?

I have pretty bad gingivitis I was diagnosed with it awhile ago and brushed my teeth more and flossed and used special mouth wash but then my work schedule changed and I started having to get up at 4 in the morning and slowly but surely I stopped remembering to floss or use the mouth wash. Well my gums are now worse they look raw on one side of my mouth and I have 2 small ulcers on my gum line where the raw ones are. I am terrified of the dentist I have had some very bad experiences and I don't tolerate pain well. But I don't want to lose my teeth either I want to be healthy! I bought an electric tooth brush and it makes my gums bleed a ton but my teeth look and feel 10 times cleaner, I am also using the rest of the medicated mouth wash and gargling with salt water and trying hard to remember to floss. If I make an appointment with the dentist office what treatment can I expect and how much pain...?