Injecting - No register IV xanax swollen vein!!!! urgent

[blackdb1]

Swim just erased his 1st post on accident!!!
Swim came home determined to IV xanax and crushed, added water, boiled, stirred, repeated over and over until clean crystal clear solution was in barrel
Swim stuck himself in the spot he uses most frequently but could get NO BLOOD just air!!!!
He kept puishin the air out and re stickin himself about a half dozen times even in 2 different veins and no register!!!
He knows he hit the vein!!!
Was the needle clogged???
Is there something that could be making swim unable to register??? He got blood in the barrel the lat time but couldn't register!!! He knew he was in a vein so pushed 3/4ths of it into his vein and it swelled up huge like it did a while back!!!
Swim really needs advice as to what caused him to not be able to register? Do veins callas and make it unusable anymore? Swims only IV'ed maybe a dozen times?? Please someone help swim figure out what went wrong??? Now he has a hard bump at the injection site! Please any answers!!!!