I want to buy half a gram right now

I quit xanax and ketamine. I quit ketamine for 1 month. Xanax for 2 weeks. But im craving something, even crushing up old left over ativan and hydroxyzine to snort. Weed and alchol never hit the fix, and alchol makes me feel horrid. Should i get a half gram of K? Is it ok to relapse?