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Dear Sister my heart goes out to you about this challenge you are facing. Have you prayed to God for healing, have you confided in your Pastor or a Spiritual authority you can trust to pray with you. Why not give pastor Dunamis a call. I have heard testimonies of people with this type of challenge that got healed after being prayed for. I strongly feel you will be healed when prayed for.
Secondly I think at this stage of your courtship, you should let your fiance know about your challenge, if he genuinely loves you and he's the will of God for you then he will also see the challenge as his and may actually look for ways in which it could be solved, but If he breakes up the relationship because of that then, he may not be able to handle bigger challenges that could come In marriage.
But I still feel strongly in my heart that you should present this case to God and he will heal you, then when you tell your fiance about it, it will be inform of a testimony.