Headaches, Unable To Focus, Eye Sight Power Increases, Blurry Vision. What Nay Be Wrong?

Hi. A couple of weeks ago I got new glasses. I had not gotten glasses in 5 years, so when I went the doctor said that she would give me a reduced prescription because the strongest one would be too much for me to handle. When I got the glasses, I had a really bad time focusing and had really bad headaches, to the point where I had to leave work. I took them back and they checked me and gave me a stronger prescription. Although I can see sharper now, I do have headaches and have a hard time focusing when Im walking. It is like I am in another world. In glass, it takes me a while to focus on the board. First it is blurry and then it focuses in. I have called my doctor multiple times, but they say that I am still adjusting and it will take a while because I have not had glasses in a long time. I am nearsighted with two astigs. by the way. I understand what they mean, but it has been almost four days and I still have problems walking and focusing. What is happening to me? Is this normal?