I did my usual shot last night in my left quad. Ive done these shots before and had some pain but not like this. Im currently taking 500mg a week of Nile co sust. 1 shot monday morning 1 shot thursday night, but today my left quad is a little swollen and really stiff. Is this something to worry about or is it normal? Theres no redness around the inject site either. Any help with this would be great!