Hi there ~
I understand your concerns. I believe that your feeling light headed dizzy having tongue swelling and dry throat are all related to marijuana usage. I also believe that you may be having problems with feeling this way due to the usage becoming so extensive that you may be dependent on the substance. I also believe that you will benefit from consulting a psychiatrist
who is experienced in the treatment of drug and substance abuse
I hope this helps. Take care of yourself and have a lovely day!