Erin, 41C is hot. I am in serious breathing problems over 30C. If you already have evidence of breathing problems and have a home ventilator, then yes, if it gets bad, go to the ER. Advise them that is suspected MG... take your Mestinon meds with you. They may not be able to treat the MG, but if your breathing worsens, they may be able to confirm MG from your breathing problems.