welcome to HCM forum,
Various muscles are coordinated with each other to perform any movement in our human body. Any incoordination
in them leads to pain/structural problems/aches etc..... Since all your investigating reports are normal you can get assessed by a Physiotherapist regarding your complaints..... Since painkillers are working only for shorter duration you can take few sessions of Physiotherapy
including pain killing electrotherapy
modalities like pulsed ultrasound therapy, some breathing exercises and kinesio taping from a certified therapist...... These would definitely help you out from your complaints......
Wish your pain comes down very soon......