How do I know if i have serotonin syndrome from 1.8g of mdma?

I took 1.8g of molly over the course of 8 hours and a 8oz bag of nitrous. I started out with a .3g bump to test the potency and I still didnt feel anything. Then I took another .3g bump 30 min later and I still didnt feel anything until the 1st bump I took kicked in and I was just lightly buzzing (not a full trip, just a light buzz) and then I started taking 2-3 hits of nitrous every 20-30 min. I still didnt feel anything from the molly until I took a .5g bump 4 hours ago. I havent taken any nitrous since I took the .5g bump of molly. For the past hour and a half, I dont know how to explain my condition. Everything is heightened, i feel very hot even though im sitting in an airconditioned room, my heart is pounding very hard, im sweating like crazy, my vision is blurred and im shaking a little bit. Does this sound like mild serotonin syndrome? What can I do to get rid of it? Please help. I can barely type this right now.