I am so sorry you are experiencing this low period.
Have you consulted with your physician?
Until you do speak to him/her........ what things are you doing to boost your seratonin levels?
If you aren't already, try to get at least 15 minutes of direct sunlight, drink plenty of fluids(water is best!), and raise your heartbeat through exercise for at least 30-50 minutes per day and aim for at least 8 hours of restful sleep.
Are you in a relationship?
Do you have any hobbies or interests.
Perhaps now is the time to venture into books like Steve Hassan's and Ray's.
Maybe enroll in an art class!
Maybe get a pet, unconditional love is very theraputic
Keep posting......
A very concerned about you being healthy and balanced....Yknot.