No doubt too late to be of any use in this thread , however when I O.D the symptoms usually are :
[ 1 ] Seriously nodding off ; maybe unconscious with face on table , etc ,..
[ 2 ] Really mean headache - like a migraine , or worse - that may or may not reduce after one throws up . But in serious cases will persist or return after vomiting
[ 3 ] Nausea intense ... maybe even unable to keep sips of water down ..... bringinging up bile , etc , ..... If possible , try to get medical help - you are in a bad way and maybe worse that you realize ; and will certainly be in fit state to cope with it your own
I am not sure if meth is helpful or not with heroin O . D ; I have no experience with meth .
However , I nearly killed myself with good smack last week , and the experience is still fresh in my mind ....
I believe that I am alive today only through good luck , rather than any good management of the situation .