I am totally exhausted all the time. I have been working nights on and off for about 15 years . In my 20 s, I could work 12hr nights 4 in a row, go home cook and clean my home. Now in my late 30 s, I am zonked. I have been taking vitamin B , ginseng, and immune boosters. What else can I take or do? I have fallen asleep without warning. I scare myself.