hi,welcome to HCM
what are you upto man,,want to kill yourself or loose your limb..
intra arterial injections are very dangerous,,
infact i advice you to stop all these injections and drugs which can damage your health and family lifetingling
,numbness after the injection seems that the injection is spilled into the tissues and has damaged small arterioles,capiillaries and veinules and is irritating the nerve
consult a doctor
immediately and follow up to prevent further damage to you