Please help. I have really bad gum disease (periodontitis I think thats what its called) a few of my bottom teeth are showing through my gums. I am scared my teeth are going to fall out but I am scared of the dentist (also the cost )

Can anyone tell me how/if they can fix the problem, what they do to fix it. I think they would have to thoroughly clean my teeth and gums but maybe they are too bad I might need surgery.

I am 25 and don't want false teeth by the time I'm 30.