Dear Nitya, as per your history it seems that you might have developed locked back. This can only be unlocked by an expert Physiotherapist who is certified/ experienced on manual therapy or by a chiropractor. If it is a trigger point that can also be managed by trigger point release technique (TPR) along with pulsed ultrasound
therapy over those trigger points. Taping technique could also be helpful to some extent in this case. You need to visit a Physiotherapist who is specialized on (M.P.T in) "musculoskeletal conditions/ sports injuries/orthopaedics".. As per your query you can use that cream you have mentioned.... Wish you a pain free back soon.