i (15F) have been diagnosed with depression for around a year now and have been on a few different meds and have found one that works for me really well ( 150mg Desvenlafaxine ). 

Around a month ago directly after my menstrual cycle ended i began to have 24/7 thoughts about suicide and self-harm, it was all i could think about and it was horrible. In my experience it didn't feel like what i experienced in the past with depression, i Had energy but these thoughts were just all i could think about. It lasted around 4 days then i went back to normal. 

When i bought this up to my GP and psychiatrist they both brushed it off. The GP just completely ignored my questions and the psychiatrist told me that he didn't have a solid scientifically answer and couldn't help me , He then at the end of the session said i should start only seeing him once ever 3-5 months compared to the monthly calls.

i just feel very scared that it will happen again and make me do something life threatening...  Has anyone experienced anything like this?