dear friends thanx for sharing your concern
first of all you have to brush you teeth twice daily , and regularly if you don't you are increasing your gum problems.
now try to understand, that brushing your teeth will not damage your teeth rather it will improve its condition.
use a soft brush and a toothpaste and brush them even after each meal. to start with, you should go to your dentist
and get scaling done this will reduce bleeding from your gums (gingivitis
you said , you have all your teeth discolored there is solution for this too. it can be treated cosmetically.
so first of all , start brushing and be positive . all your problems related to teeth can be well managed. need to visit to your dentist.
use hexidine mouthwash frequently .