Hi... Pls do not sit at home for a self diagnosis... It can be something like a severe spasm to facet lock... It gives similar presentations...
Next Steps
u need to see a physiotherapist and let them decide if u need only hot formentation or contrast treatment which requires icing as well, also this would require some manual therapy which could be MFR or even low grade mobilization of facet, to be done by the therapist
Health Tips
if u are not allergic to ice... do cold formentation for 10 mins .. it will never worsen .. maybe it can help... but be very careful as icing also causes burns like heat.