I'm sure others will stop by to share how they are doing in this regard, Whoodee.
Surgery puts a lot of stress on your body and often there is poor sleep or sleep disturbances involved in recovery. In addition, I'm sure you've been a bit anxious with the recent discovery, procedure and now waiting for results. Plus we just went through the holidays which is an exhausting time for many.
Our body's energy supply isn't limitless. So when we're in healing mode after major surgery our energy will be used for healing first, not leaving a great reserve for all the other activity of daily life. It is completely normal to feel tired for quite some time. How long....most likely relates to your body's rate of healing. Making our best effort to get adequate sleep and rest is beneficial.
Our body does the best healing while we're sleeping.
In case you haven't read it yet, following is an article from the Recovery Guidelines on the topic of Energy Drain
You're not alone in this and since you're not even three months post op, it's not surprising. With lots of restorative rest this will slowly ease.
Sweet Dreams tonight!