Itchy vagina, thick discharge green tint, slight odor not fishy. Already tested for yeast infection and STD’s. Been continuous w/o sex for months?

Yeast. Vaginal itching without discharge can indicate infections like yeast or stis like herpes. It can indicate an allergic reaction to household products like certain soaps and laundry detergents. There are also some skin conditions liked lichen sclerosis which can cause vaginal itching. Start with an over the counter yeast cream. If not improving schedule a visit.