Hello! I am so new to this so thank you for putting it out there that this heat may be causing my off-balance issues, too. I have noticed this with myself the past couple days but did not equate it to the heat. I have to try to slow down, too. 😒 Is your vision issue related to your MS? I have not yet been diagnosed but my daughter has MS, my brain MRI is abnormal, I see a neuro on August 9 and symptoms are leaning toward MS, which was noted as a possible diagnosis on my MRI report. Stay cool!!!