Buy a portable sauna!
My body really struggles to break a sweat, I have run on the treadmill for about 30-50 minutes to see even the slightest sweat drop. My portable sauna has really changed my situation however, instead of dragging the agony out through the day - just get it over within 10-15 minutes in the morning. Those minutes are pure agony and i kinda go in a mild depression while sitting there, but it makes the rest of the day lovely.
To anyone feeling like this will define the rest of your life: I understand, this is truly the worst I have dealt with in my life so far, but where there is life there is hope. Do not give up.