Suggest Effects Of Amphetamine Overdose

The problem is, I have taken an amphetamine (speed) overdose. I took a gram in the late stages of yesterday and a gram the night before. Last night I was vomiting constantly and still feel like vomiting now, whenever I breath I feel the urge to be sick, and I am worried at the thought of being sick (and not proceeding to vomit) because I haven t got rid of the amphetamines that are still in my system. Also my head feels strange and overheated and I am experiencing heart palpitations which were more extreme earlier. I need your advice on what to do, and I need to know know how long it takes before you are safe from the dangers of a high amphetamine (speed) overdose?