Does this sound like teenage hormones or an actual medical problem?
Hormone experts would say that most mental illness comes from imbalanced hormones at least contributing , anyway. With your suicidal thoughts and the fluctuations pretty noticeable, it sounds like a hormone imbalance that can be causing some problems. You do need to be evaluated properly, and I hope you seek out a comprehensive evaluation, that includes a hormone profile, including thyroid, diet, vitamins/minerals, tests , and don’t let someone use too many scans that use harmful radiation in them, because they are over used and can increase your risk of cancer. the only places i know of that do these type evaluations are amenclinics.com and lawlispeavey.com the PNP center, but there are others. If you don’t do that, you will likely be told you are bipolar or something without checking any other reasons that you feel this way, and put on medications. I hope you go to the trouble of checking.