Seizures. From cocaine mainly, smoked and IV, countless times, once too much speed and a double massive pipe got me out, but also tram+speed, on ket 2 times, from benzo WD few times, from anti psychotics... My head would hurt so much after and i would be totally off for hours having dfifficulty to remember anything. couldnt stand up, tongue bitten to blood, couldnt speak or move, open eyes or anything. Very fucking painful and you wonder if you gonna survive it each time, quite scary. I got checked and I am not epileptic.
Bad trip on Nbomb gave me perma visuals, tracers and strange colors for few months after
Missing shots, when the skin go red with bumps in multiple places it's fucking atrocious feeling. Very worrying but still had to get something in there but some morning I was so shaky cause so sick and cold that I would be missing shots.
Vasoconstriction yes from amphetamines and methcathinones
Losing veins.