How To Deal With Withdrawal Symptoms Of Quitting Pot, Alcohol And Tobacco Products?

Im 19 and have been a pot smoker for about 6 years two of which were every single day. I started developing a swelling feeling in my throat glands and tonsils, a roughness to my throat, paranoia, shakes, and nausea. This would happen every once in a while if i smoked a large amount but not very bad and would go away after a half hour or so. The past month it has become terrible, i had never even considered medical attention for it till now. Iv'e forced myself to quit smoking which is very difficult. I used to assist with sleep and stress, I spent a good amount of last year smoking tobacco products and drinking alcohol but have pretty completely removed both of those from my life. Im at a total loss iv'e never had anything like this, no clue what to do.