Hello, 2 days ago I was smoking marijuana and after 30 minutes I was starting to have uncontrollable twitches and my heart was racing. I was also having breathing problems. Im 14 years old, I weight 130 and Im on Ritalin LA. The next day the vein in my neck has been hurting but I don't know if its from the marijuana or something else. Can you please help me and tell me what I need to do to relieve this neck pain in the vein and the quickest way to get the marijuana out of my system which may be causing these symptoms.