Fibromyalgia: This condition is characterized by widespread musculoskeletal pain, fatigue, sleep, memory, and mood issues. The symptoms of joint pain, pelvic pain, and numbness in fingertips can be associated with fibromyalgia, especially considering the patient's age and gender. Fibromyalgia is more common in women and can present with a variety of symptoms including dizziness.

Rheumatoid Arthritis (RA): RA is an autoimmune disorder that causes inflammation and pain in the joints. It can also lead to numbness or tingling in the hands and feet due to nerve compression or inflammation. Pelvic pain and dizziness can be secondary symptoms.
Lupus: Systemic Lupus Erythematosus (SLE) is an autoimmune disease that can affect various parts of the body, including the joints, skin, kidneys, and other organs. Symptoms can include joint pain, pelvic pain, and neurological manifestations such as numbness and dizziness.
Hypothyroidism: This condition, where the thyroid gland doesn't produce enough thyroid hormone, can lead to joint pain, numbness or tingling in the fingers, and dizziness. Pelvic pain could be related to menstrual irregularities that can occur with hypothyroidism.

Multiple Sclerosis (MS): MS is a chronic disease affecting the central nervous system, leading to symptoms such as numbness, weakness, vision loss, and tremor. While less common, it's crucial not to miss this diagnosis due to its significant impact on quality of life and the availability of disease-modifying treatments.
Vitamin B12 Deficiency: A deficiency in vitamin B12 can cause numbness or tingling in the hands and feet, joint pain, and dizziness. It's essential to diagnose and treat this condition to prevent long-term neurological damage.
Ovarian Cysts or Endometriosis: These conditions can cause pelvic pain and, in some cases, might contribute to or exacerbate other symptoms like dizziness if there's associated significant blood loss or pain.

Sjögren's Syndrome: An autoimmune disorder that primarily affects the glands that produce tears and saliva but can also cause joint pain and neurological symptoms.
Mixed Connective Tissue Disease (MCTD): A disorder that combines features of lupus, scleroderma, and rheumatoid arthritis, which could explain the wide range of symptoms.
Peripheral Neuropathy: Damage to the peripheral nerves can cause numbness, tingling, and pain, usually in the hands and feet. While it can be associated with various conditions, as a standalone diagnosis, it's less likely but should be considered if other diagnoses are ruled out.