Mirtazapine, weight gain regardless of diet

I was told about the risk of weight gain but told it was more to do with increased appetite than fat binding, etc and that as long as I watched what I consumed I'd be fine.  Roll on six weeks and I have surgery and after a further six weeks I feel enormous but put it down to swelling and post-op "taking it easy".  Decide to take control and join weightwatchers to find I'd put on over two stone and am the heaviest I've ever been.  One week in with little effort I lose 9lb but three weeks in I've regained 2lb and feel huge again.  Only difference, other than increasing my exercise, was that I'd ran out of mirtazapine 30mg five days before the 9lb loss as my repeat prescription failed to materialise and I started again the day after.  Can weight loss and gain be that rapid be purely down to the mirtazapine?  Having a history of bulimia I am tempted instead to ditch the pills, lose the weight and take the chance that withdrawals are not too catastrophic.  Certainly won't miss the twitchy left eyebrow either!

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