I've felt the symptoms from past lives during flashbacks and meditation, and even when just thinking about it...in one past life experience I froze to death, this was very long ago in the 1800, and I have flashbacks from another past life in the 1920's (one past life that ended in drowning when I froze when my potential husband at the time was used to taking his jacket on me and so on) then jump to another life during the 1950's when my then current boyfriend would hold my hands in his and warm them up by his like making an imaginary fire even though we were then in sunny California. In this life I have always felt cold, even though my skin can be warm but it is not serious and it won't kill me. When I experienced the past life when I froze to death I thought it made sense what both others and I have always thought was strange that I would freeze (when other's think the temperature is normal).
Perhaps in some cases one only get temporary symptoms and other times it can create a real diagnose originating from a past life's diagnose
Another just temporary symptoms is that I used to get, from nowhere, feelings of sadness and depression even though I was otherwise a happy-go-kid. Later with flashbacks I experienced a potential past life when I had been really unhappy so I think it just got over me without me knowing why, it was a relief when I put two and two together, not that I had been so unhappy in that life but that I could explain why and put it behind me.