Almost fainting?

Kate

Can ALMOST fainting be a concern during 2nd trimester 20w 3d? I went to Crater Lake to try and get my announcement photos. The elevation is 8k and it was about 80 degrees outside. I was standing in line for the restroom with no shade. I got very light headed, my ears were ringing and blurred vision. I was able to get to shade and relax. I feel fine now just don’t know if it’s something I should run by my doctor on Monday.