I feel like there's something in my vagina, what could be the reason for this?

Patient's question:

I always feel the urge to go to the toilet, which seems like frequent urination, but when I get to the toilet, there's nothing there. Also, I feel like there's something inside my vagina, and it's a bit itchy. It doesn't feel bad when sitting, but it's uncomfortable when walking?
Detailed medical history and consultation purpose:
Duration of the current illness and persistence: About 15 days

Doctor's answer:

Hello
Can you check if there is any inflammation?
Vaginitis
Vaginitis refers to a group of inflammatory diseases of the vaginal mucosa caused by various etiologies. Under normal physiological conditions, the anatomical and biochemical characteristics of the vaginal tissue are sufficient to defend against external microbial invasion. If this defense mechanism is compromised, pathogens can take advantage of the situation and, under various factors, lead to vaginal inflammation.
① Non-specific vaginitis: The external genitalia and vagina may experience a sense of heaviness and burning. There is significant shedding of vaginal epithelial cells, congestion of the vaginal mucosa, and pronounced tenderness. In severe cases, symptoms may include general fatigue, lower abdominal discomfort, excessive vaginal discharge (purulent or serous), which can irritate the urethral opening, leading to frequent urination and dysuria.
② Candidal vaginitis: The most prominent symptoms of this condition are increased vaginal discharge and intense itching of the external genitalia and vagina. When symptoms are severe, individuals may feel restless and extremely uncomfortable, and may also experience frequent urination, dysuria, and pain during intercourse. The vaginal discharge is thick, white, and curd-like, with the vaginal mucosa showing marked edema. White, patchy membranes adhere to the mucosa and are easily removable, revealing an eroded base or shallow ulcers beneath. In severe cases, bruising may be left behind. Another subset of patients may have copious watery or purulent discharge without white curd-like patches, with the vaginal mucosa showing moderate redness and edema, minimal itching or burning, and only a sensation of dampness in the external genitalia.
③ Trichomoniasis: The vaginal discharge is increased and may be yellowish-white or occasionally yellowish-green, foamy, and malodorous. In severe cases, it may contain blood. Other symptoms include lower back pain, frequent urination, dysuria, external genital itching, and mild lower abdominal pain. The vaginal mucosa is red and swollen, with scattered bleeding points or strawberry-like elevations. In some cases, it may cause sexual