I have severe neurological symptoms like permanent exhaustion, worsening memory, lack of concentration, anxiety and depression?

I’m 20 and have levels of estradiol and progesterone below the level of detection while levels of FSH, prolactin, thyroid hormones and haematology are normal. I also have severe neurological symptoms like permanent exhaustion, worsening memory, lack of concentration, anxiety and depression. It also involves increased heart rate (but low blood pressure), hot and cold flashes, hair loss and lack of menstruation (for 6 months). I don’t know what to do and where to start because I haven’t received any sensible diagnosis yet and seeing a specialist requires queuing – at the moment i cannot function normally and I would be really grateful for any suggestions, even guesses.