Never been to the dentist since I was 10 years old and never looked after my teeth

Ive never been back to the dentists since i was a very young child in the 1950’s and 1960’s as iv’e been teriffied of going see a dentist because i was forced to have general anaesthetic as i was screaming and terrified of having my teeth taken out and i had to be held down to have the gas. Since then iv’e practically never brushed my teeth and now my breath has got a really bad smell, and my gums have got plach all over my gums and have been bleeding as well. Now this evening one of my teeth is appears to be loose. I dont know what to do as im terrified of the dentists. What can i do?