I actually had an episode earlier this week, so trust me your not alone. I got off vibes about this person and I had a lot of anxiety. It could also be a gut feeling your getting and feel anxious about that certain someone. I know if I don't know the person very well, I get anxiety and sometimes I just get bad feelings around that person. I noticed my anxiety went away the moment I cut off all contact with this person and I haven't felt any anxiety since than. This could be the case or it could just be your anxiety. Just talk to your doctor about it and tell them exactly what your feeling. Have you tried meditating at all? It has helped me a lot. This may or may not have helped you, but I hope you feel better in the future.