I've been injecting in my neck for a number of years now and am finally having some issues that are freaking me out. Aside from really thick scar tissue up and down both sides, the veins have doubled in size and stay that way. The veins are lumpy in spots and I have to hold my breath to get blood to actually register. Half the time, I'll be in the vein but still can't register because the blood won't rush in. Any feedback on what could be going wrong would be great.