I am 8 days post op and completely understand your situation. Most of what you've described has been my first week as well. I've been put right by a few nice folks here, and by my visiting therapist, that this is not as easy as it seemed like it might be and that this is a MAJOR operation.
I read so many stories about people feeling instantly great after their surgery and being able to walk again very soon. Watched many youtube videos of patients in the hospital just 18 hours after surgery walking much better than I am at 8 days.
But tiny little improvements are making themselves known each day. So I had to reconcile myself to patience and slow down my push to be normal a bit. I just took an extra pain tablet each day, started resting and icing more, and cut back on my PT a bit, and I believe I can see the benefits already.
I also felt like my implant was too large, stiff, tight, etc. But I have to remember that even when I was younger and had a tooth filled, it felt weird and altered my bite just a little bit. Something this major is bound to feel extraordinary.
I'm even noticing a strange issue in my non-operated leg, where I feel this rubber band like snapping sensation like something is catching on a nerve or tendon and twanging it like a guitar string when I walk. I think the whole body will probably manifest a few strange quirks while this process plays out, so hang in there and by all means consult your doctor again if you need further examination or a fresh xray to set your mind at ease.
Just wanted you to know that my experience has been almost exactly like yours and you are not alone in what you're feeling and perceiving.