Ooooh, Tiarah.....we just got through the heat wave in Indiana that you are now getting in New York. YES the heat can do everything you are experiencing, including that dimmed vision.
Try to stay cool, stay well hydrated. Advil has worked very well for me, though I have a couple of stronger prescription painkillers to use if the pain gets bad enough. So far, I have just stubbornly toughed it out.
Give your body a chance to just rest for a few days. What you may have bounced from in a day before all ofthis kicked in can take several days if you're experiencing flares of MS.
I have also found gentle stretching and walking help when my legs ache with MS.
My neuro gave me some simple but powerful-good advice when I was dx'd...he said my body would tell me when it needs to rest...and to LISTEN to it.