My glass prescription seems too strong?

i just got back from hour eyes i got a new pair of glasses because i lost my other ones, my other ones were 1.50 in one eye and 1.25 in the other and i got those about 3-4 years ago however those glasses seemed perfect for me still until i lost them, not too strong not too weak, my new prescription is -1.75 in both and it seems way too strong, it makes me feel a little dizzy, is that normal? should i go back and tell them? i dont know what to do