Mom is experiencing these attacks which she feels so weak then faints and has a constant headache. Any ideas?

Mom is 40 and is experiencing this for 2 months. She has hypotension, but not blood sugar or any type of heart disease (according to what doctors told us here in Afghanistan). This evening she experienced another one which left her not feeling and/or controlling her legs for about an hour. When she started feeling it back now, she feels something moving underneath her skin in her legs (something she describes like ants moving under her skin). She always has headache since the past 2 months and sometimes it gets so severe that can’t sleep even with sleep medicine injections. Doctors told us that its nerves that causes it. We don’t get it, how? (Even they don’t)

Please help us with tests or advice that help with the right diagnosis?