frequent injections will definetelly affect your nervous system...the impact is enormous...it is for this reason that after an injection your injection feels like post training soreness...well not w/ compounds such as EQ,deca,but frequent prop,suspension,sust injections all feel that way...be sure to verify your CK levels as well on your next blood test,seeing as how frequent injections affect these levels in a negative way...fyi...perhaps your body just needs recup from frequent injections...