When I Smoke Marijuana After About 5-10 Minutes I Start

When i smoke marijuana after about 5-10 minutes i start to feel slightly sick, then i just want to lay down roll my eyes back and it is similar to seizure like rolling back. My extremities twitch, though i am completely conscious. I have a difficult time talking when this happens, after "it" stops i just feel high but my eyes are extremely sore and my muscles are sore and lethargic. I am really confused as to why this happens, i used to smoke marijuana and nothing bad happened then one day this did. I have smoke many kinds of marijuana from many different people, this always happens. What is going on!?