Use eucalyptus oil, it has anti- inflammatory properties that helps to ease muscle pain . For this you can checkout Anveya's eucalyptus oil. It is pure and natural.

For backache hot water helps , you can also try eucalyptus oil mixed with a carrier oil like coconut oil , massage it at effected area , this gives some relief from pain , use from a good brand like Anveya.

You could use a hot water bag and also if the pain is too much please see a doctor in that case