Hi My Boyfriend Just Tried Shooting Up Meth Recently And

hi my boyfriend just tried shooting up meth recently and two nights ago he was trying and he felt like a little pop and it hurt and the pain is getting worse and iys swullen and is getting worse. he is having some back pain too but is unsure if the two are related. what could be wrong and is it necessary to seek prof medical help. hes afraid to go to the hospital or dr bc of fear hell get in trouble