Hello, Your girlfriend complained of her hands and feet going numb after intercourse. She had also fainted 2 weeks ago after donating blood. Your Gf is suggested to take care of her health. She should take adequate fluid, water, beverage to keep her vitals normal. Low sodium-potassium level may cause dizziness or weakness, low blood pressure or low blood sugar level may trigger her symptoms. She should not skip meals and get tested to ensure she is not anemic. She should take care of her general health condition. Before penetrative sex , make sure that her vitals are normal. Some women go numb as a reaction to orgasm, it can be a possibility. However, medical conditions like neuropathy, diabetes, cardiovascular abnormalities can present with such symptoms. Get her a complete medical check up done. Her treatment will depend on the diagnosis made. In the meantime, ensure that she does not skips meals and takes home made nutritious food. She should stay away from addictions if any. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician