Good afternoon and thank you for the opportunity to help in answering your question. First let me say that I'm sincerely XXXXX XXXXX hear of the difficulty you're experiencing. Based on the detailed information you've kindly provided I wouldn't worry too much about SFI as has a genetic basis so if there's no family history you should be fine in that regard.
As for the sleep issue it sounds as though the onset is directly correlated with you moving to a new area away from family and friends as well as starting medical school...both of which can be significant stressors and each could contribute to the insomnia, if not cause it. Please correct me if I'm wrong but my impression is such that you may be experiencing difficulty with adjusting to your new life and the demands and responsibilities that come with it.
My suggestion would be to stay on the medication for now and use as an adjunct dome relaxation techniques such as progressive muscle relaxation (YouTube search will demonstrate how to do this) and guided imagery could also be helpful. I would suggest trying these for a week and if you do not notice any improvement it may be beneficial to speak with a therapist to help you manage better the adjustment you're experiencing. This is by no means uncommon and I've seen it and treated it often in my practice. It's rather easy for stress
to have such an impact on us and not even realize it.
I hope that I've been helpful in answering your question and that you found my suggestions to be of benefit to you.
Please let me know if you have any further questions as I want to ensure your question is completely and thoroughly answered.
If you feel I've answered your question to your satisfaction I would sincerely XXXXX XXXXX clicking the ACCEPT button thereby giving me credit for the answer. I hope this finds you well and look forward to your response.