Hello there,,,well yes it is most probably a muscle spasm...and you may not be getting adequate rest from work or commute hence...it may not be healing at the pace it should....... you would be definately all right with 5 Physio settings of SWD and IFT vector for 20 mins at the affected area.....without any topical gel application.
Next Steps
Visit a nearest Physiotherapy Clinic or a hospital based physio OPD.
Health Tips
Take rest till the pain subsides to 20% of what it was when it started....and exercises should be commensed only when pain has decreased considerably.
do resort back with any furthur queries.
Regards & take care.