Welcome to HCM,
You suffered a Viral infection recently and developed this pain in costal cartilages and ribs at joints.
This is benign condition and there is swelling and inflammation at the joint.There is Costochondritis
in this condition.
It is related with respiratory movement and in sneezing
movement is there so more painful.
In this condition pain may even radiate to left shoulder and arm and mimic Cardiac pain, hence it is necessary to rule out cardiac cause by EKG.
Relief is there by reducing the movement of chest.
Cold compress locally/and/or massage
also help to reduce pain.Stress may increase pain so keep it to minimum as far as possible.
Some anti-inflammatory drug may be take with consultation of your treating doctor.
Some time local injection of steroid
or local anesthetic
may be required for pain.
Usually with time this condition improves in few weeks may be 6 to 12 weeks maximum.