I am really sorry that you are suffering though this right now! Severe depression to the point of 'wanting to end it' as you felt previously is scary! And I don't want you to get to that point again. I'm a mama too and I know you want to be there for your kiddos.
So, I wouldn't think about this in terms of the Cymbalta causing this but rather that it is not treating it. You were prescribed that medication a long time ago and for different symptoms. Medications can sometimes stop working or not work as well over time and this is why perhaps your doctor took the route of increasing the dosage. That can often do the trick. However, it is not working for you this time so you must see your doctor again. Depression and anxiety are the type of thing that can sometimes be trial and error to get medicinal treatment just right. There are many options of medication and dosing regimes within those options that doctors explore to help someone with clinical depression. Please consider talking to your doctor and be open to what they suggest. Since you have had suicidal thoughts previously, I would also think a psychiatrist would be the best option for you rather than a primary care doctor. They spend all day helping people in similar situations such as yourself so are best equipped to guide you through. A psychologist or talk therapist is also an important component to treatment. Do you do this? I know with a family, this can all take time and money and it's hard! But the end product of your feeling better and functioning better in your role of mom and wife is SO worth it!!
Please come back and let us know what you think and how things are going. and if you feel suicidal AT ALL, please reach out. There are help lines you can call and people to help. Let me know if you need AnY resources like that. hugs