Hi Camila,
thanks for sharing!
So we learn about your back pain:
*it is an ongoing issue, there must be triggers that reactivate the process
*It started abruptly, there must have been a significant point (a damage or a conflict resolution) right before it began. It gets more when you rest means it's mainly during your body's attempt to repair.
*It co-reacts with other organs (ovaries), probably the hormonal shift in the menstrual cycle is a trigger (a regeneration trigger or a conditioned trigger warning for a threat). Hormones create a general reaction, while the spine and certain vertebrae make a more local reaction, and there are 2 conflict themes interacting here
*It began with 19 years, means you had the "original" conflict at that age already. It was about your self-esteem and lack of suppport. In addition, you had the "abandonment conflict" which made healing circumstances worse. The ovary/hormonal theme may have been about the loss of a person, or about your role as a woman?

In your case this is not about a megalomania. This is a special thing which we'll discuss soon when we cover "constellations".

And about your sinusitis:
*It is a repetitive pattern that grew with time - more weight was added in the process.
*It feels like an overall reaction but I'd say it's local and affects structures in your head.
*The symptoms (inflammation, pressure by oedema) tell us about a repair phase after a "loss of sensory contact" (smelling, seeing, hearing) which your story confirms.
*Again, this is accompanied by a simultaneous abandonment conflict that adds more fluid/pressure.
*You were sensitized to the theme already as a child. 

So, in order to stop the ongoing patterns, you want to make sure that these conflicts don't threaten you anymore.
Do you have any ideas what will stabilize your self-esteem and enable you to let go of the need (or prpmise) to search for the persons that disappeared?