ketamine blackouts

for the past year ive been heavily using ket going 2 weeks without it at most, using about 10-20g a week, getting excruciating k cramps. more recently ive stopped being able to k hole and stopped feeling the full ketty effects i go from pretty much sober to one more line and im completely blackout and dont remember a thing, the people im with say its like an overdose i go unresponsive dribble all over myself, talk absolute nonsense and act traumatised.. it takes about 1-2 hours to come back around and when i do the only thing i remember is sniffing the last line. ive tried doing all sorts of different doses but the thing is i dont really feel the ket anymore at all. has this happened to anyone else?