adjustment to new glasses

I recently got new glasses with a new rx. I have astigmatism and apparently my rx changed. Looking through the new lenses, everything definitely looks brighter and clearer. If I look through my old lenses now, I am surprised how blurry things look. I've been wearing these new lenses for about three weeks now. During about the first week I was having some trouble and felt rather disoriented because some surfaces looked slanted or warped. This seemed to especially be the case with surfaces I was nearer too, and in less than perfect light--say the kitchen counter when cutting vegetables. Over the three weeks I've been wearing the new lenses this has gotten better. But I am still having this disorienting experience of things seeming somehow off or somewhat slanted when I am observing surfaces that are fairly near to me. It is better than before but still an issue.
Wondering if anyone else has had this issue and if they eventually got used to their new glasses. Should I expect this to keep improving over time or do I need new lenses? I have heard that this may be due to the astigmatism part of an rx being too strong, but I'm wondering how they will know what the right strength is for me if it was really incorrect the first time. If it's just trial and error, couldn't my second pair be equally problematic?
Thanks for your feedback.

adjustment to new glasses