I myself am going through the same **** at this moment in time in my life. I am currently 27 and have been feeling like this for almost 6 weeks now and like you it all stemmed from a comment which I have let get into my head and it has really started to take a hold of my life. Anyway my question to you is, did you find it hard embracing the thoughts? as I am afraid if I embrace them my mind will start to get comfortable with them and will tell me its actually the reality of the situation.