Mentally unstable. Help and medications.

I am okay for most of the days. But around my periods I become triggered by even a smallest thing. And then I really become uncontrollable. I don't know how my husband is holding up. I lose all my self esteem, self control, I cry a lot until I have severe headache, I become and become so nagging to to talk to my partner. And of course I regret this behaviour and then I am worried if he will divorce me. In general I am happy in my married life but I am not happy in my personal life. I have started studying CA but had to leave it because of not passing and now I am studying another professional course. I have lost focus. I also have suicidal thoughts on one of these days. I always think I am very late to pass the exam and look for a job. I feel I am not worthy of my husband. And I am very weak mentally. I am always worried about our relationship even if somewhere I know he loves me. I wish not to trouble him because of my reactions. I plan to seek a professional help and medications.