Our expert says:
Firstly, it sounds sad that you don't seem to have been well treated at the start, with maybe too many drugs and too little psychotherapy. However, its good to hear that you've worked through more therapy and become OK-- well done. I"m not sure that this went as far as MUnchausens ( I am actually one of the very few people to have treated several people with Munchausens, for their real problems rather than those they were simulating ). But its not uncommon both to get hypochondriacal with depression and stress, and to be tempted to complain of physical ill-health ( which may feel more respectable than psych disorders ) to gain some support, understanding and sympathy. You might feel that you yourself might be unloveable, but that with cancer you'd deserve some caring otherwise not available to you.
Anyhow, you apparently encountered some of the major disadvantages of a Munchausen's strategy. If you want, maybe you could gently approach the topic with those good friends who have stayed, mentioning how embarrassing it seems on looking back at it, and how you now understand what happened --- as they're still with you, they'd probably understand.
A small point, but one I'm picky about --- there is no such thing as post-traumatic stress ( which would be stress AFTER a trauma ---unless an ambulance man after fetching you from an accident, drops the stretcher you're on --- the condition is Post Traumatic Stress Disorder, a Disorder that comes on Post / After a Traumatic Stress.
Your theory makes a lot of sense, and fits with my own experience of working with Munchausens --- maybe especially typical the fact of your sister having been genuinely ill, and receiving all the attention while you got none. And the bad relationship must have felt similarly neglectful.
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