I feel like ever since I attempted to switch my daughter to whole milk she has just been non stop sick. I tried…

I feel like ever since I attempted to switch my daughter to whole milk she has just been non stop sick. I tried switching her 9/2. she started getting really bad diaherra, causing a rash. but I waited a week figured her body just had to adjust. s week went by and she was miserable. so i took her to the Dr. they told me it was a yeast infection. So gave me cream and told me to take her off the whole milk. here we are s week later from that appointment and she still has the rash but not as bad, she's all stuffed up, and fever off and on. I just checked and it was at 102.3 I have a almost 3 hour drive home and I just hope she can handle driving: / I feel so bad for her.