Is it serious?

Patient: I have resently come off the jab and have yet to get a period and it has been 5 months . im extremly tired all the time and i sleep constantly ,i bruise very easily ,my back achs , i get a stitch feeling even when im sitting still , my nipples are very tender and sore , i get head achs all the time . i need help i dont know whats happening ? and im 100% not pregnant.