General aches and pains could be secondary to viral illness, fatigue, stress
, musculoskeletal issues, etc. The shakiness could be due to low blood sugar
, anxiety, chills secondary to infection process. The easy bruising could be due to a low plalelet count or other abnormality in blood count
The bottom line here is to have a complete medical evaluation by your primary care provider. Hopefully after a detailed history, physical, and testing, your doctor will have a diagnosis(es) and will be able to provide a treatment plan.
Best of luck. I hope you feel better soon.