You believe that asking for help is not necessary. You don’t think it would be beneficial and you worry that it could make you seem melodramatic. I understand your reasoning for not wanting to ask for help but it would be ill-advised to rule it out.
You also mention that you “implied” to your mother that you are having problems. She didn’t take you seriously. I’m not certain what you meant by the term implied but I take it to mean that you did not provide her with many details about your issues. Perhaps she did not take you seriously because you withheld many important facts from her. I suspect that you did not tell her the full truth. If you were to speak to her and tell her exactly what you are experiencing then she may take you seriously. I would strongly encourage you to do this. If she does not know that there is a problem then it is going to be difficult for her to provide you adequate help.
I think counseling would be very beneficial to you. You should consider it. As you mention in some ways you are able to handle your problems but on the other hand they seem to be getting worse. When you have bouts of depression they last longer than they used to and are more severe. The periods of depression also include thoughts of suicide. These are signs that help is needed.
I’m also concerned with your sleep disturbances and hallucinations. The hallucinations may be related to the inability to sleep but it also may signify an underlying mental health disorder. The only way to know what is in fact occurring is to be evaluated by a mental health professional. A sleep study may also be in order.
It is encouraging that you have periods in your life when you feel good. Ultimately you’d want to have only periods of positivity and happiness and to eliminate the bouts of depression. It is not unusual for individuals to feel sadness from time to time. Those feelings happen to everyone and are relatively normal. It is not normal or healthy to have extended periods of depression that are characterized by suicidal thinking. That is why it is important that you consider counseling.
You asked about what you can do to address your problems and I believe the best course of action would be to speak to your mother. Have an honest conversation with her about what you are struggling with. Don’t imply what you’re problems are, tell her the complete truth. Maybe then she would take you seriously and get you the help that you need and deserve. Thank you for your question and I wish you the best of luck.