I've been taking prednisone for asthma for four days. The blurred...

I've been taking prednisone for asthma for four days. The blurred vision is EXTREMELY significant when the page is saying call the doctor. I'm always thirsty, I cannot urinate, and I am sooo restless. I cannot sleep more than three or four hours a stretch. I was on 60 mg for the first three days and now I'm on 40 mg a day. Tomorrow I start 20 mg a day. Should I just discontinue now while I still have okay vision? Or will my eyesite come back to normal after the script is through? Someone please let me know. This is all new to me.