It probably seems like you do not need to do anything more. Please relax. I hope you have got your ECG done and it is normal. If this is not done, please get it done. Yet again, if it is normal, nothing to worry.
It probably seems like a muscle sprain
. Please give yourself adequate rest, you may apply sprays like volini
for relief of pain, maintain erect posture while working on your PC.
Hope this helps you.
Wish you quick recovery.