Cancer. please answer.?

I have been smoking for one/two months and also smoking weed as I got into hanging around with the wrong people... When I was in spain 2/3weeks ago I had some weed whilst heavily drunk and I started to feel strange so I have stopped everything completely... I feel dizzy with headaches and sometimes pains in my chest I don't know whether I'm just paraniod as I don't know what could have been in that weed in spain and I'm freaking out, can anyone tell me what might have been in it and what I should do!? Please help.