The condition you are experiencing right now could be related to phantosmia, which is characteristic of a potentially unpleasant "phantom" smell that persists for several weeks. Several medical conditions can be the cause if this is the case. We are talking here about atrophic rhinitis, head trauma and nasal polyps, among others. On the medication side (which is more of my expertise), it is noted that doxycycline can cause this type of reaction in very rare cases. Considering the timeline of the facts you describe, I believe it would be very relevant to consider doxycycline as the cause. For what reason was it prescribed to you? Thank you for the information. I therefore recommend that you discuss tomorrow with your pharmacist (and your ophthalmologist in a short time) so that we can find an alternative to Doxycycline. Also know that it is absolutely necessary that your pharmacist (or yourself) notify Health Canada of this effect. It is very very rare and should be subject to a more in-depth analysis.