Hmmm, and I thought this had only happened to me! Many years ago when I was inactive, a thought became very persistent in my mind that because of my inactivity I had denied the Holy Ghost. This bothered me so much I knelt down and offered a very fervent, emotional prayer. When I was finished, those thoughts completely vanished. Later it became obvious to me that those thoughts were from the Adversary, because it's very easy not to understand what condition the scriptures that have been quoted are speaking of. Those scriptures speak of those who have been given to know - shown - that Jesus is Christ by the power of the Holy Ghost. These aren't people who have faith - as Alma speaks of - that He is the Christ, but a perfect knowledge. These are they who have been visited by the Son and have a perfect knowledge of his divine calling and Atonement, yet deny Him and crucify Him afresh. This is a level of knowledge not generally achieved, unfortunately. Even Peter, who denied the Lord 3 times, who had been a personal witness to many of the important events in Christ's ministry, didn't achieve the level of knowledge of the meaning of these things until the Holy Ghost came upon them and manifested to them afterward a complete understanding of their import and meaning, and almost literally writing it into their souls, as testimony is written line-by-line into ours if we allow it. If you had done this, you would certainly know. You would be a vessel of wrath. Those who achieve a bright light, if they fall, become a greater darkness than the fallen who had only possessed a lesser light. Just ask Lucifer. Pray about it and ask your burden be lifted, and be at ease. I think you're OK.