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Hello, I am very sorry that you are struggling with these symptoms, I can understand how distressing this can be for you. Lamotrigine is actually a very effective medication to treat depressive symptoms and is currently being explored to lessen severe anxiety because of its Glumatate regulation function. I am not sure where you read that Lamotrigine would cause weight gain, but this is actually considered a weight neutral medication. There are some interactions with a Contraception Pill with Lamotrigine, but usually these interactions are minor and the hair loss issue is considered a rare adverse effect occurring in less than 1 percent of people.
Other medications that may be considered would be Aripiprazole or Ziprasidone as these medications have mood stabilizing function to lessen depression and anxiety. Also these two medications are also considered weight neutral and should not cause weight gain either. Since Seroquel is in the same class as these two medications, they could be very effective for you and your symptoms.
Other than this though, there are no other medications that are considered weight neutral and will treat your Depression and Anxiety. But a non-medication option could be the use of Transcranial Magnetic Stimulation (TMS) which is used to treat mainly resistant depressive disorders and anxiety disorders with a 70-80 percent success rate. This treatment uses magnetic waves to stimulate your neurotransmitters which can lessen your depression and anxiety. The good news about this treatment is that the side effects are considerably low as well with the most common being headaches and scalp irritation for a few days. So this could be an option to discuss with your psychiatrist that may be outside the box.
I hope this answers your questions and gives you some guidance on this issue. I wish you all the best and I hope that your symptoms lessen very soon with the right treatment. Please let me know if you have any questions or concerns as I am happy to assist and support you regarding this issue.
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