Piglet, you need to plan for at least 12 weeks off from work if at all possible. You want to give yourself plenty of time. If you do especially well and can go back sooner, then you and your boss are happy at that change in plans. Happiness doesn't always work with the other direction should you need to tell him you must be off longer than planned.
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give support and encouragement,
and have a laugh or two :hysterical: along your journey to a pain free life.