Being as you haven't worn glasses in a long time, the vision will feel different with them compared to contacts.
With glasses you have a slight difference in image size that you don't get with contacts , and you are also more restricted by the peripheral vision limitations of glasses compared to contacts.
It can take a good week to feel normal with the glasses after so long. Wear them at least 3 or 4 hours a day if you can and you should be fine in a few days.
It is a normal reaction.