Eye Focusing Problems And Dark Vision?

for a while now, ive been getting dark vision and dizzy when i stand, as if i blinked slowly. lately, maybe within the past week, ive also been having trouble focusing my eyes with no pattern as to when this shows up, neither brightness nor distance of where im looking. im wondering if this could be related? im 15, have astigmatism (i wear both contacts and glasses), and lately have also been feeling tired and stressed. what could be some possible causes of this? i believe my mother has meniere’s disease, could i be showing signs of this at an early age?

Contacts All The Sudden Not Focusing?

I wear toric lenses for my astigmatism I have in both eyes. They help my eyes focus. All of the sudden last Tuesday I noticed the lenses are not focusing as well. I have had these lenses for awhile. About a year. My doc tells me to wear them til they bother me because they are expensive. Do you think they are just too old now and I need a new pair? I just don’t get why they all of the sudden stopped focusing.